255149999 has 4 divisors (see below), whose sum is σ = 274776936. Its totient is φ = 235523064.

The previous prime is 255149987. The next prime is 255150029. The reversal of 255149999 is 999941552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 255149999 - 2²⁰ = 254101423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 255149999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255149959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9813449 + ... + 9813474.

It is an arithmetic number, because the mean of its divisors is an integer number (68694234).

Almost surely, 2^255149999 is an apocalyptic number.

255149999 is a deficient number, since it is larger than the sum of its proper divisors (19626937).

255149999 is a wasteful number, since it uses less digits than its factorization.

255149999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19626936.

The product of its digits is 1312200, while the sum is 53.

The square root of 255149999 is about 15973.4153830670. The cubic root of 255149999 is about 634.2568850572.

The spelling of 255149999 in words is "two hundred fifty-five million, one hundred forty-nine thousand, nine hundred ninety-nine".