255309531 has 4 divisors (see below), whose sum is σ = 340412712. Its totient is φ = 170206352.

The previous prime is 255309511. The next prime is 255309547. The reversal of 255309531 is 135903552.

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 255309531 - 2¹¹ = 255307483 is a prime.

It is a super-2 number, since 2×255309531² = 130365913238879922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 255309492 and 255309501.

It is not an unprimeable number, because it can be changed into a prime (255309511) 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, 42551586 + ... + 42551591.

It is an arithmetic number, because the mean of its divisors is an integer number (85103178).

Almost surely, 2^255309531 is an apocalyptic number.

255309531 is a deficient number, since it is larger than the sum of its proper divisors (85103181).

255309531 is an equidigital number, since it uses as much as digits as its factorization.

255309531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85103180.

The product of its (nonzero) digits is 20250, while the sum is 33.

The square root of 255309531 is about 15978.4082749190. The cubic root of 255309531 is about 634.3890467774.

The spelling of 255309531 in words is "two hundred fifty-five million, three hundred nine thousand, five hundred thirty-one".