12657191 has 2 divisors, whose sum is σ = 12657192. Its totient is φ = 12657190.

The previous prime is 12657187. The next prime is 12657209. The reversal of 12657191 is 19175621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12657191 - 2² = 12657187 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 (12657121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6328595 + 6328596.

It is an arithmetic number, because the mean of its divisors is an integer number (6328596).

Almost surely, 2^12657191 is an apocalyptic number.

12657191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12657191 is an equidigital number, since it uses as much as digits as its factorization.

12657191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 32.

The square root of 12657191 is about 3557.6946187103. The cubic root of 12657191 is about 233.0482134198.

The spelling of 12657191 in words is "twelve million, six hundred fifty-seven thousand, one hundred ninety-one".