31611316572081 has 6 divisors (see below), whose sum is σ = 45660790604130. Its totient is φ = 21074211048048.

The previous prime is 31611316572047. The next prime is 31611316572107. The reversal of 31611316572081 is 18027561311613.

31611316572081 is a `hidden beast` number, since 3 + 1 + 61 + 1 + 3 + 16 + 572 + 0 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 24438775586481 + 7172540985600 = 4943559^2 + 2678160^2 .

It is not a de Polignac number, because 31611316572081 - 2¹¹ = 31611316570033 is a prime.

It is a super-2 number, since 2×31611316572081² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31611316572001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1756184253996 + ... + 1756184254013.

It is an arithmetic number, because the mean of its divisors is an integer number (7610131767355).

Almost surely, 2^{31611316572081} is an apocalyptic number.

It is an amenable number.

31611316572081 is a deficient number, since it is larger than the sum of its proper divisors (14049474032049).

31611316572081 is a wasteful number, since it uses less digits than its factorization.

31611316572081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512368508015 (or 3512368508012 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

Adding to 31611316572081 its reverse (18027561311613), we get a palindrome (49638877883694).

The spelling of 31611316572081 in words is "thirty-one trillion, six hundred eleven billion, three hundred sixteen million, five hundred seventy-two thousand, eighty-one".