312131320202 has 16 divisors (see below), whose sum is σ = 504233325960. Its totient is φ = 144054554112.

The previous prime is 312131320187. The next prime is 312131320213. The reversal of 312131320202 is 202023131213.

It can be written as a sum of positive squares in 4 ways, for example, as 175208379241 + 136922940961 = 418579^2 + 370031^2 .

It is a super-2 number, since 2×312131320202² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411074 + ... + 890642.

Almost surely, 2^312131320202 is an apocalyptic number.

312131320202 is a deficient number, since it is larger than the sum of its proper divisors (192102005758).

312131320202 is a wasteful number, since it uses less digits than its factorization.

312131320202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504617.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 312131320202 its reverse (202023131213), we get a palindrome (514154451415).

The spelling of 312131320202 in words is "three hundred twelve billion, one hundred thirty-one million, three hundred twenty thousand, two hundred two".