31343515681 has 9 divisors (see below), whose sum is σ = 32392884369. Its totient is φ = 30327123300.

The previous prime is 31343515633. The next prime is 31343515691. The reversal of 31343515681 is 18651534313.

The square root of 31343515681 is 177041.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-31343515681 is a prime.

It is a super-2 number, since 2×31343515681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31343515691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5485416 + ... + 5491126.

Almost surely, 2^31343515681 is an apocalyptic number.

31343515681 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31343515681 is the 177041-st square number.

31343515681 is the 88521-st centered octagonal number.

It is an amenable number.

31343515681 is a deficient number, since it is larger than the sum of its proper divisors (1049368688).

31343515681 is an frugal number, since it uses more digits than its factorization.

31343515681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11484 (or 5742 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The spelling of 31343515681 in words is "thirty-one billion, three hundred forty-three million, five hundred fifteen thousand, six hundred eighty-one".