12647491 has 2 divisors, whose sum is σ = 12647492. Its totient is φ = 12647490.

The previous prime is 12647489. The next prime is 12647513. The reversal of 12647491 is 19474621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12647491 - 2¹ = 12647489 is a prime.

Together with 12647489, it forms a pair of twin primes.

It is equal to p₈₂₇₇₂₈ and since 12647491 and 827728 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12642491) 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, 6323745 + 6323746.

It is an arithmetic number, because the mean of its divisors is an integer number (6323746).

Almost surely, 2^12647491 is an apocalyptic number.

12647491 is a deficient number, since it is larger than the sum of its proper divisors (1).

12647491 is an equidigital number, since it uses as much as digits as its factorization.

12647491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 12647491 is about 3556.3311150679. The cubic root of 12647491 is about 232.9886650469.

The spelling of 12647491 in words is "twelve million, six hundred forty-seven thousand, four hundred ninety-one".