31631632138 has 8 divisors (see below), whose sum is σ = 47452654980. Its totient is φ = 15814080480.

The previous prime is 31631632129. The next prime is 31631632147. The reversal of 31631632138 is 83123613613.

It is an interprime number because it is at equal distance from previous prime (31631632129) and next prime (31631632147).

It can be written as a sum of positive squares in 2 ways, for example, as 31525067809 + 106564329 = 177553^2 + 10323^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 31631632097 and 31631632106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844893 + ... + 881536.

Almost surely, 2^31631632138 is an apocalyptic number.

31631632138 is a deficient number, since it is larger than the sum of its proper divisors (15821022842).

31631632138 is a wasteful number, since it uses less digits than its factorization.

31631632138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735592.

The product of its digits is 46656, while the sum is 37.

The spelling of 31631632138 in words is "thirty-one billion, six hundred thirty-one million, six hundred thirty-two thousand, one hundred thirty-eight".