12517657 has 4 divisors (see below), whose sum is σ = 12533940. Its totient is φ = 12501376.

The previous prime is 12517613. The next prime is 12517667. The reversal of 12517657 is 75671521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75671521 = 487 ⋅155383.

It can be written as a sum of positive squares in 2 ways, for example, as 8433216 + 4084441 = 2904^2 + 2021^2 .

It is a cyclic number.

It is not a de Polignac number, because 12517657 - 2¹⁵ = 12484889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12517607) 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 in 3 ways as a sum of consecutive naturals, for example, 6928 + ... + 8545.

It is an arithmetic number, because the mean of its divisors is an integer number (3133485).

Almost surely, 2^12517657 is an apocalyptic number.

It is an amenable number.

12517657 is a deficient number, since it is larger than the sum of its proper divisors (16283).

12517657 is an equidigital number, since it uses as much as digits as its factorization.

12517657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16282.

The product of its digits is 14700, while the sum is 34.

The square root of 12517657 is about 3538.0301016243. The cubic root of 12517657 is about 232.1886656470.

The spelling of 12517657 in words is "twelve million, five hundred seventeen thousand, six hundred fifty-seven".