31916748559081 has 27 divisors (see below), whose sum is σ = 34027000115589. Its totient is φ = 29931274493568.

The previous prime is 31916748559079. The next prime is 31916748559099. The reversal of 31916748559081 is 18095584761913.

The square root of 31916748559081 is 5649491.

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

It can be written as a sum of positive squares in 4 ways, for example, as 5173163742681 + 26743584816400 = 2274459^2 + 5171420^2 .

It is not a de Polignac number, because 31916748559081 - 2¹ = 31916748559079 is a prime.

It is a super-2 number, since 2×31916748559081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31916748558998 and 31916748559016.

It is not an unprimeable number, because it can be changed into a prime (31916748559781) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 42162150955 + ... + 42162151711.

Almost surely, 2^{31916748559081} is an apocalyptic number.

31916748559081 is the 5649491-st square number.

31916748559081 is the 2824746-th centered octagonal number.

It is an amenable number.

31916748559081 is a deficient number, since it is larger than the sum of its proper divisors (2110251556508).

31916748559081 is an frugal number, since it uses more digits than its factorization.

31916748559081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426 (or 1213 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 67.

The spelling of 31916748559081 in words is "thirty-one trillion, nine hundred sixteen billion, seven hundred forty-eight million, five hundred fifty-nine thousand, eighty-one".