12634591 has 2 divisors, whose sum is σ = 12634592. Its totient is φ = 12634590.

The previous prime is 12634579. The next prime is 12634597. The reversal of 12634591 is 19543621.

It is a strong prime.

It is an emirp because it is prime and its reverse (19543621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12634591 - 2⁷ = 12634463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12634597) 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, 6317295 + 6317296.

It is an arithmetic number, because the mean of its divisors is an integer number (6317296).

Almost surely, 2^12634591 is an apocalyptic number.

12634591 is a deficient number, since it is larger than the sum of its proper divisors (1).

12634591 is an equidigital number, since it uses as much as digits as its factorization.

12634591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 12634591 is about 3554.5169854707. The cubic root of 12634591 is about 232.9094246608.

It can be divided in two parts, 12634 and 591, that added together give a square (13225 = 115²).

The spelling of 12634591 in words is "twelve million, six hundred thirty-four thousand, five hundred ninety-one".