12636551 has 2 divisors, whose sum is σ = 12636552. Its totient is φ = 12636550.

The previous prime is 12636529. The next prime is 12636599. The reversal of 12636551 is 15563621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12636551 - 2¹⁸ = 12374407 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12636521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6318275 + 6318276.

It is an arithmetic number, because the mean of its divisors is an integer number (6318276).

Almost surely, 2^12636551 is an apocalyptic number.

12636551 is a deficient number, since it is larger than the sum of its proper divisors (1).

12636551 is an equidigital number, since it uses as much as digits as its factorization.

12636551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 12636551 is about 3554.7926803120. The cubic root of 12636551 is about 232.9214677592.

The spelling of 12636551 in words is "twelve million, six hundred thirty-six thousand, five hundred fifty-one".