31640603531 has 2 divisors, whose sum is σ = 31640603532. Its totient is φ = 31640603530.

The previous prime is 31640603483. The next prime is 31640603587. The reversal of 31640603531 is 13530604613.

It is a weak prime.

It is an emirp because it is prime and its reverse (13530604613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31640603531 is a prime.

It is a super-2 number, since 2×31640603531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31640653531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15820301765 + 15820301766.

It is an arithmetic number, because the mean of its divisors is an integer number (15820301766).

Almost surely, 2^31640603531 is an apocalyptic number.

31640603531 is a deficient number, since it is larger than the sum of its proper divisors (1).

31640603531 is an equidigital number, since it uses as much as digits as its factorization.

31640603531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 32.

The spelling of 31640603531 in words is "thirty-one billion, six hundred forty million, six hundred three thousand, five hundred thirty-one".