31789938561 has 4 divisors (see below), whose sum is σ = 42386584752. Its totient is φ = 21193292372.

The previous prime is 31789938553. The next prime is 31789938577. The reversal of 31789938561 is 16583998713.

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 31789938561 - 2³ = 31789938553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31789938495 and 31789938504.

It is not an unprimeable number, because it can be changed into a prime (31789937561) 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, 5298323091 + ... + 5298323096.

It is an arithmetic number, because the mean of its divisors is an integer number (10596646188).

Almost surely, 2^31789938561 is an apocalyptic number.

It is an amenable number.

31789938561 is a deficient number, since it is larger than the sum of its proper divisors (10596646191).

31789938561 is a wasteful number, since it uses less digits than its factorization.

31789938561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10596646190.

The product of its digits is 9797760, while the sum is 60.

The spelling of 31789938561 in words is "thirty-one billion, seven hundred eighty-nine million, nine hundred thirty-eight thousand, five hundred sixty-one".