31611930609 has 16 divisors (see below), whose sum is σ = 49153635200. Its totient is φ = 18063959760.

The previous prime is 31611930601. The next prime is 31611930619. The reversal of 31611930609 is 90603911613.

It is not a de Polignac number, because 31611930609 - 2³ = 31611930601 is a prime.

It is a super-2 number, since 2×31611930609² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31611930601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15359482 + ... + 15361539.

It is an arithmetic number, because the mean of its divisors is an integer number (3072102200).

Almost surely, 2^31611930609 is an apocalyptic number.

It is an amenable number.

31611930609 is a deficient number, since it is larger than the sum of its proper divisors (17541704591).

31611930609 is an equidigital number, since it uses as much as digits as its factorization.

31611930609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30721045 (or 30721031 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 39.

The spelling of 31611930609 in words is "thirty-one billion, six hundred eleven million, nine hundred thirty thousand, six hundred nine".