31630020051 has 16 divisors (see below), whose sum is σ = 48207101184. Its totient is φ = 18070931424.

The previous prime is 31630020041. The next prime is 31630020053. The reversal of 31630020051 is 15002003613.

It is not a de Polignac number, because 31630020051 - 2⁷ = 31630019923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (31630020053) 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, 22485 + ... + 252518.

It is an arithmetic number, because the mean of its divisors is an integer number (3012943824).

Almost surely, 2^31630020051 is an apocalyptic number.

31630020051 is a deficient number, since it is larger than the sum of its proper divisors (16577081133).

31630020051 is a wasteful number, since it uses less digits than its factorization.

31630020051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280490.

The product of its (nonzero) digits is 540, while the sum is 21.

Adding to 31630020051 its reverse (15002003613), we get a palindrome (46632023664).

The spelling of 31630020051 in words is "thirty-one billion, six hundred thirty million, twenty thousand, fifty-one".