12291913 has 4 divisors (see below), whose sum is σ = 12826368. Its totient is φ = 11757460.

The previous prime is 12291899. The next prime is 12291941. The reversal of 12291913 is 31919221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31919221 = 19 ⋅1679959.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12291913 is a prime.

It is a super-2 number, since 2×12291913² = 302182250399138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12291313) 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, 267193 + ... + 267238.

It is an arithmetic number, because the mean of its divisors is an integer number (3206592).

Almost surely, 2^12291913 is an apocalyptic number.

It is an amenable number.

12291913 is a deficient number, since it is larger than the sum of its proper divisors (534455).

12291913 is an equidigital number, since it uses as much as digits as its factorization.

12291913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534454.

The product of its digits is 972, while the sum is 28.

The square root of 12291913 is about 3505.9824585984. The cubic root of 12291913 is about 230.7844231052.

The spelling of 12291913 in words is "twelve million, two hundred ninety-one thousand, nine hundred thirteen".