12631639 has 2 divisors, whose sum is σ = 12631640. Its totient is φ = 12631638.

The previous prime is 12631621. The next prime is 12631643. The reversal of 12631639 is 93613621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12631639 - 2⁵ = 12631607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12631639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12631609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6315819 + 6315820.

It is an arithmetic number, because the mean of its divisors is an integer number (6315820).

Almost surely, 2^12631639 is an apocalyptic number.

12631639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12631639 is an equidigital number, since it uses as much as digits as its factorization.

12631639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 12631639 is about 3554.1017149204. The cubic root of 12631639 is about 232.8912839291.

The spelling of 12631639 in words is "twelve million, six hundred thirty-one thousand, six hundred thirty-nine".