31116031661 has 64 divisors (see below), whose sum is σ = 39123544320. Its totient is φ = 24354570240.

The previous prime is 31116031633. The next prime is 31116031691. The reversal of 31116031661 is 16613061113.

It is not a de Polignac number, because 31116031661 - 2³⁴ = 13936162477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31116031691) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14724941 + ... + 14727053.

It is an arithmetic number, because the mean of its divisors is an integer number (611305380).

Almost surely, 2^31116031661 is an apocalyptic number.

It is an amenable number.

31116031661 is a deficient number, since it is larger than the sum of its proper divisors (8007512659).

31116031661 is a wasteful number, since it uses less digits than its factorization.

31116031661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286.

The product of its (nonzero) digits is 1944, while the sum is 29.

Adding to 31116031661 its reverse (16613061113), we get a palindrome (47729092774).

The spelling of 31116031661 in words is "thirty-one billion, one hundred sixteen million, thirty-one thousand, six hundred sixty-one".