31314487681 has 9 divisors (see below), whose sum is σ = 31470809923. Its totient is φ = 31158940720.

The previous prime is 31314487667. The next prime is 31314487691. The reversal of 31314487681 is 18678441313.

The square root of 31314487681 is 176959.

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

It can be written as a sum of positive squares in only one way, i.e., 5161129281 + 26153358400 = 71841^2 + 161720^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31314487681 is a prime.

It is a super-2 number, since 2×31314487681² (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 (31314487691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 55033965 + ... + 55034533.

Almost surely, 2^31314487681 is an apocalyptic number.

31314487681 is the 176959-th square number.

31314487681 is the 88480-th centered octagonal number.

It is an amenable number.

31314487681 is a deficient number, since it is larger than the sum of its proper divisors (156322242).

31314487681 is an frugal number, since it uses more digits than its factorization.

31314487681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760 (or 880 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The spelling of 31314487681 in words is "thirty-one billion, three hundred fourteen million, four hundred eighty-seven thousand, six hundred eighty-one".