31631903399 has 16 divisors (see below), whose sum is σ = 34164480000. Its totient is φ = 29188486080.

The previous prime is 31631903377. The next prime is 31631903431. The reversal of 31631903399 is 99330913613.

It is a cyclic number.

It is not a de Polignac number, because 31631903399 - 2⁸ = 31631903143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31631903299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449402 + ... + 515000.

It is an arithmetic number, because the mean of its divisors is an integer number (2135280000).

Almost surely, 2^31631903399 is an apocalyptic number.

31631903399 is a deficient number, since it is larger than the sum of its proper divisors (2532576601).

31631903399 is a wasteful number, since it uses less digits than its factorization.

31631903399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66278.

The product of its (nonzero) digits is 354294, while the sum is 47.

The spelling of 31631903399 in words is "thirty-one billion, six hundred thirty-one million, nine hundred three thousand, three hundred ninety-nine".