31639506131 has 2 divisors, whose sum is σ = 31639506132. Its totient is φ = 31639506130.

The previous prime is 31639506023. The next prime is 31639506139. The reversal of 31639506131 is 13160593613.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31639506131 is a prime.

It is a super-2 number, since 2×31639506131² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31639506139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15819753065 + 15819753066.

It is an arithmetic number, because the mean of its divisors is an integer number (15819753066).

Almost surely, 2^31639506131 is an apocalyptic number.

31639506131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31639506131 is an equidigital number, since it uses as much as digits as its factorization.

31639506131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 38.

The spelling of 31639506131 in words is "thirty-one billion, six hundred thirty-nine million, five hundred six thousand, one hundred thirty-one".