312731351522 has 6 divisors (see below), whose sum is σ = 469098213579. Its totient is φ = 156365280330.

The previous prime is 312731351489. The next prime is 312731351551. The reversal of 312731351522 is 225153137213.

It can be written as a sum of positive squares in only one way, i.e., 156365675761 + 156365675761 = 395431^2 + 395431^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=395431.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 593147 + ... + 988577.

Almost surely, 2^312731351522 is an apocalyptic number.

312731351522 is a deficient number, since it is larger than the sum of its proper divisors (156366862057).

312731351522 is an frugal number, since it uses more digits than its factorization.

312731351522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790864 (or 395433 counting only the distinct ones).

The product of its digits is 37800, while the sum is 35.

Adding to 312731351522 its reverse (225153137213), we get a palindrome (537884488735).

The spelling of 312731351522 in words is "three hundred twelve billion, seven hundred thirty-one million, three hundred fifty-one thousand, five hundred twenty-two".