12631621 has 2 divisors, whose sum is σ = 12631622. Its totient is φ = 12631620.

The previous prime is 12631609. The next prime is 12631639. The reversal of 12631621 is 12613621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11390625 + 1240996 = 3375^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 12631621 - 2⁵ = 12631589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12631592 and 12631601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12631721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6315810 + 6315811.

It is an arithmetic number, because the mean of its divisors is an integer number (6315811).

Almost surely, 2^12631621 is an apocalyptic number.

It is an amenable number.

12631621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12631621 is an equidigital number, since it uses as much as digits as its factorization.

12631621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 12631621 is about 3554.0991826340. The cubic root of 12631621 is about 232.8911733062.

The spelling of 12631621 in words is "twelve million, six hundred thirty-one thousand, six hundred twenty-one".