15972631 has 2 divisors, whose sum is σ = 15972632. Its totient is φ = 15972630.

The previous prime is 15972617. The next prime is 15972637. The reversal of 15972631 is 13627951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15972631 - 2⁹ = 15972119 is a prime.

It is a super-2 number, since 2×15972631² = 510249882124322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15972637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7986315 + 7986316.

It is an arithmetic number, because the mean of its divisors is an integer number (7986316).

Almost surely, 2^15972631 is an apocalyptic number.

15972631 is a deficient number, since it is larger than the sum of its proper divisors (1).

15972631 is an equidigital number, since it uses as much as digits as its factorization.

15972631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 34.

The square root of 15972631 is about 3996.5774107353. The cubic root of 15972631 is about 251.8404497308.

The spelling of 15972631 in words is "fifteen million, nine hundred seventy-two thousand, six hundred thirty-one".