12491317 has 4 divisors (see below), whose sum is σ = 12508960. Its totient is φ = 12473676.

The previous prime is 12491299. The next prime is 12491321. The reversal of 12491317 is 71319421.

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-12491317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7713 + ... + 9190.

It is an arithmetic number, because the mean of its divisors is an integer number (3127240).

Almost surely, 2^12491317 is an apocalyptic number.

It is an amenable number.

12491317 is a deficient number, since it is larger than the sum of its proper divisors (17643).

12491317 is an equidigital number, since it uses as much as digits as its factorization.

12491317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17642.

The product of its digits is 1512, while the sum is 28.

The square root of 12491317 is about 3534.3057309746. The cubic root of 12491317 is about 232.0256920120.

The spelling of 12491317 in words is "twelve million, four hundred ninety-one thousand, three hundred seventeen".