12638551 has 2 divisors, whose sum is σ = 12638552. Its totient is φ = 12638550.

The previous prime is 12638543. The next prime is 12638581. The reversal of 12638551 is 15583621.

12638551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12638551 - 2³ = 12638543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12638501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319275 + 6319276.

It is an arithmetic number, because the mean of its divisors is an integer number (6319276).

Almost surely, 2^12638551 is an apocalyptic number.

12638551 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638551 is an equidigital number, since it uses as much as digits as its factorization.

12638551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 12638551 is about 3555.0739795397. The cubic root of 12638551 is about 232.9337553515.

The spelling of 12638551 in words is "twelve million, six hundred thirty-eight thousand, five hundred fifty-one".