255139257 has 8 divisors (see below), whose sum is σ = 340295776. Its totient is φ = 170037792.

The previous prime is 255139249. The next prime is 255139319. The reversal of 255139257 is 752931552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 255139257 - 2³ = 255139249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255132257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1348 + ... + 22629.

It is an arithmetic number, because the mean of its divisors is an integer number (42536972).

Almost surely, 2^255139257 is an apocalyptic number.

It is an amenable number.

255139257 is a deficient number, since it is larger than the sum of its proper divisors (85156519).

255139257 is a wasteful number, since it uses less digits than its factorization.

255139257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27527.

The product of its digits is 94500, while the sum is 39.

The square root of 255139257 is about 15973.0791333418. The cubic root of 255139257 is about 634.2479840407.

The spelling of 255139257 in words is "two hundred fifty-five million, one hundred thirty-nine thousand, two hundred fifty-seven".