255135531 has 32 divisors (see below), whose sum is σ = 397555200. Its totient is φ = 142534656.

The previous prime is 255135523. The next prime is 255135539. The reversal of 255135531 is 135531552.

It is an interprime number because it is at equal distance from previous prime (255135523) and next prime (255135539).

It is not a de Polignac number, because 255135531 - 2³ = 255135523 is a prime.

It is a super-2 number, since 2×255135531² = 130188278357303922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (255135539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209035 + ... + 210251.

It is an arithmetic number, because the mean of its divisors is an integer number (12423600).

Almost surely, 2^255135531 is an apocalyptic number.

255135531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

255135531 is a deficient number, since it is larger than the sum of its proper divisors (142419669).

255135531 is a wasteful number, since it uses less digits than its factorization.

255135531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443.

The product of its digits is 11250, while the sum is 30.

The square root of 255135531 is about 15972.9624991734. The cubic root of 255135531 is about 634.2448965510.

The spelling of 255135531 in words is "two hundred fifty-five million, one hundred thirty-five thousand, five hundred thirty-one".