12557491 has 2 divisors, whose sum is σ = 12557492. Its totient is φ = 12557490.

The previous prime is 12557483. The next prime is 12557549. The reversal of 12557491 is 19475521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12557491 - 2³ = 12557483 is a prime.

It is not a weakly prime, because it can be changed into another prime (12557191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6278745 + 6278746.

It is an arithmetic number, because the mean of its divisors is an integer number (6278746).

Almost surely, 2^12557491 is an apocalyptic number.

12557491 is a deficient number, since it is larger than the sum of its proper divisors (1).

12557491 is an equidigital number, since it uses as much as digits as its factorization.

12557491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The square root of 12557491 is about 3543.6550340009. The cubic root of 12557491 is about 232.4346970412.

The spelling of 12557491 in words is "twelve million, five hundred fifty-seven thousand, four hundred ninety-one".