312531596881 has 4 divisors (see below), whose sum is σ = 357178967872. Its totient is φ = 267884225892.

The previous prime is 312531596879. The next prime is 312531596903. The reversal of 312531596881 is 188695135213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 312531596881 - 2¹ = 312531596879 is a prime.

It is a super-2 number, since 2×312531596881² (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 (312531596801) 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 3 ways as a sum of consecutive naturals, for example, 22323685485 + ... + 22323685498.

It is an arithmetic number, because the mean of its divisors is an integer number (89294741968).

Almost surely, 2^312531596881 is an apocalyptic number.

It is an amenable number.

312531596881 is a deficient number, since it is larger than the sum of its proper divisors (44647370991).

312531596881 is an equidigital number, since it uses as much as digits as its factorization.

312531596881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44647370990.

The product of its digits is 1555200, while the sum is 52.

The spelling of 312531596881 in words is "three hundred twelve billion, five hundred thirty-one million, five hundred ninety-six thousand, eight hundred eighty-one".