31181909056 has 21 divisors (see below), whose sum is σ = 61879404181. Its totient is φ = 15590248192.

The previous prime is 31181909053. The next prime is 31181909093. The reversal of 31181909056 is 65090918113.

The square root of 31181909056 is 176584.

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., 30234254400 + 947654656 = 173880^2 + 30784^2 .

It is a super-2 number, since 2×31181909056² (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 (31181909051) 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 2 ways as a sum of consecutive naturals, for example, 1401636 + ... + 1423708.

Almost surely, 2^31181909056 is an apocalyptic number.

31181909056 is the 176584-th square number.

It is an amenable number.

31181909056 is a deficient number, since it is larger than the sum of its proper divisors (30697495125).

31181909056 is an frugal number, since it uses more digits than its factorization.

31181909056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44158 (or 22075 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 43.

The spelling of 31181909056 in words is "thirty-one billion, one hundred eighty-one million, nine hundred nine thousand, fifty-six".