31131536832661 has 4 divisors (see below), whose sum is σ = 31143140091712. Its totient is φ = 31119933573612.

The previous prime is 31131536832637. The next prime is 31131536832703. The reversal of 31131536832661 is 16623863513113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31131536832661 - 2⁵ = 31131536832629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131536832961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5801625501 + ... + 5801630866.

It is an arithmetic number, because the mean of its divisors is an integer number (7785785022928).

Almost surely, 2^{31131536832661} is an apocalyptic number.

It is an amenable number.

31131536832661 is a deficient number, since it is larger than the sum of its proper divisors (11603259051).

31131536832661 is a wasteful number, since it uses less digits than its factorization.

31131536832661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11603259050.

The product of its digits is 1399680, while the sum is 49.

The spelling of 31131536832661 in words is "thirty-one trillion, one hundred thirty-one billion, five hundred thirty-six million, eight hundred thirty-two thousand, six hundred sixty-one".