255139 has 4 divisors (see below), whose sum is σ = 266256. Its totient is φ = 244024.

The previous prime is 255137. The next prime is 255149. The reversal of 255139 is 931552.

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 255139 - 2¹ = 255137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255133) 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, 5524 + ... + 5569.

It is an arithmetic number, because the mean of its divisors is an integer number (66564).

2²⁵⁵¹³⁹ is an apocalyptic number.

255139 is a deficient number, since it is larger than the sum of its proper divisors (11117).

255139 is a wasteful number, since it uses less digits than its factorization.

255139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11116.

The product of its digits is 1350, while the sum is 25.

The square root of 255139 is about 505.1128586762. The cubic root of 255139 is about 63.4247771083.

The spelling of 255139 in words is "two hundred fifty-five thousand, one hundred thirty-nine".