31912606881 has 45 divisors (see below), whose sum is σ = 49892540929. Its totient is φ = 20326487544.

The previous prime is 31912606879. The next prime is 31912606883. The reversal of 31912606881 is 18860621913.

The square root of 31912606881 is 178641.

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

31912606881 is a `hidden beast` number, since 31 + 9 + 1 + 2 + 606 + 8 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (31912606879) and next prime (31912606883).

It is not a de Polignac number, because 31912606881 - 2¹ = 31912606879 is a prime.

It is a super-3 number, since 3×31912606881³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31912606883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 36978256 + ... + 36979118.

Almost surely, 2^31912606881 is an apocalyptic number.

31912606881 is the 178641-st square number.

31912606881 is the 89321-st centered octagonal number.

It is an amenable number.

31912606881 is a deficient number, since it is larger than the sum of its proper divisors (17979934048).

31912606881 is an frugal number, since it uses more digits than its factorization.

31912606881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784 (or 889 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 31912606881 in words is "thirty-one billion, nine hundred twelve million, six hundred six thousand, eight hundred eighty-one".