149 (one hundred [and] forty-nine) is the natural number between 148 and 150.
| ||||
---|---|---|---|---|
Cardinal | one hundred forty-nine | |||
Ordinal | 149th (one hundred forty-ninth) | |||
Factorization | prime | |||
Prime | 35th | |||
Divisors | 1, 149 | |||
Greek numeral | ΡΜΘ´ | |||
Roman numeral | CXLIX | |||
Binary | 100101012 | |||
Ternary | 121123 | |||
Senary | 4056 | |||
Octal | 2258 | |||
Duodecimal | 10512 | |||
Hexadecimal | 9516 |
149 is a prime number, the first prime whose difference from the previous prime is exactly 10,[1] an emirp, and an irregular prime.[2] After 1 and 127, it is the third smallest de Polignac number, an odd number that cannot be represented as a prime plus a power of two.[3] More strongly, after 1, it is the second smallest number that is not a sum of two prime powers.[4]
It is a tribonacci number, being the sum of the three preceding terms, 24, 44, 81.[5]
There are exactly 149 integer points in a closed circular disk of radius 7,[6] and exactly 149 ways of placing six queens (the maximum possible) on a 5 × 5 chess board so that each queen attacks exactly one other.[7] The barycentric subdivision of a tetrahedron produces an abstract simplicial complex with exactly 149 simplices.[8]