255397890331 has 4 divisors (see below), whose sum is σ = 256041210352. Its totient is φ = 254754570312.

The previous prime is 255397890311. The next prime is 255397890347. The reversal of 255397890331 is 133098793552.

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 255397890331 - 2¹³ = 255397882139 is a prime.

It is a super-2 number, since 2×255397890331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255397890311) 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, 321659415 + ... + 321660208.

It is an arithmetic number, because the mean of its divisors is an integer number (64010302588).

Almost surely, 2^255397890331 is an apocalyptic number.

255397890331 is a deficient number, since it is larger than the sum of its proper divisors (643320021).

255397890331 is an equidigital number, since it uses as much as digits as its factorization.

255397890331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643320020.

The product of its (nonzero) digits is 6123600, while the sum is 55.

The spelling of 255397890331 in words is "two hundred fifty-five billion, three hundred ninety-seven million, eight hundred ninety thousand, three hundred thirty-one".