12691457 has 4 divisors (see below), whose sum is σ = 12961536. Its totient is φ = 12421380.

The previous prime is 12691451. The next prime is 12691501. The reversal of 12691457 is 75419621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12691457 is a prime.

It is a super-2 number, since 2×12691457² = 322146161565698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12691451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134969 + ... + 135062.

It is an arithmetic number, because the mean of its divisors is an integer number (3240384).

Almost surely, 2^12691457 is an apocalyptic number.

It is an amenable number.

12691457 is a deficient number, since it is larger than the sum of its proper divisors (270079).

12691457 is an equidigital number, since it uses as much as digits as its factorization.

12691457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270078.

The product of its digits is 15120, while the sum is 35.

The square root of 12691457 is about 3562.5071227999. The cubic root of 12691457 is about 233.2583294077.

The spelling of 12691457 in words is "twelve million, six hundred ninety-one thousand, four hundred fifty-seven".