31131320312 has 32 divisors (see below), whose sum is σ = 61895502000. Its totient is φ = 14628539904.

The previous prime is 31131320303. The next prime is 31131320321. The reversal of 31131320312 is 21302313113.

It is an interprime number because it is at equal distance from previous prime (31131320303) and next prime (31131320321).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74687 + ... + 260462.

Almost surely, 2^31131320312 is an apocalyptic number.

It is an amenable number.

31131320312 is a deficient number, since it is larger than the sum of its proper divisors (30764181688).

31131320312 is a wasteful number, since it uses less digits than its factorization.

31131320312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335855 (or 335851 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31131320312 its reverse (21302313113), we get a palindrome (52433633425).

The spelling of 31131320312 in words is "thirty-one billion, one hundred thirty-one million, three hundred twenty thousand, three hundred twelve".