31312001331 has 16 divisors (see below), whose sum is σ = 49956469920. Its totient is φ = 19268923680.

The previous prime is 31312001323. The next prime is 31312001377. The reversal of 31312001331 is 13310021313.

It is a happy number.

31312001331 is a `hidden beast` number, since 3 + 131 + 200 + 1 + 331 = 666.

It is not a de Polignac number, because 31312001331 - 2³ = 31312001323 is a prime.

It is a super-2 number, since 2×31312001331² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31312001131) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 44603640 + ... + 44604341.

It is an arithmetic number, because the mean of its divisors is an integer number (3122279370).

Almost surely, 2^31312001331 is an apocalyptic number.

31312001331 is a deficient number, since it is larger than the sum of its proper divisors (18644468589).

31312001331 is a wasteful number, since it uses less digits than its factorization.

31312001331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89208003 (or 89207997 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31312001331 its reverse (13310021313), we get a palindrome (44622022644).

The spelling of 31312001331 in words is "thirty-one billion, three hundred twelve million, one thousand, three hundred thirty-one".