31659840461 has 4 divisors (see below), whose sum is σ = 31849420512. Its totient is φ = 31470260412.

The previous prime is 31659840439. The next prime is 31659840491. The reversal of 31659840461 is 16404895613.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16404895613 = 23 ⋅713256331.

It is a cyclic number.

It is not a de Polignac number, because 31659840461 - 2²² = 31655646157 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 (31659840491) 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, 94789775 + ... + 94790108.

It is an arithmetic number, because the mean of its divisors is an integer number (7962355128).

Almost surely, 2^31659840461 is an apocalyptic number.

It is an amenable number.

31659840461 is a deficient number, since it is larger than the sum of its proper divisors (189580051).

31659840461 is a wasteful number, since it uses less digits than its factorization.

31659840461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189580050.

The product of its (nonzero) digits is 622080, while the sum is 47.

The spelling of 31659840461 in words is "thirty-one billion, six hundred fifty-nine million, eight hundred forty thousand, four hundred sixty-one".