12972913 has 4 divisors (see below), whose sum is σ = 13034608. Its totient is φ = 12911220.

The previous prime is 12972901. The next prime is 12972929. The reversal of 12972913 is 31927921.

It is a happy number.

12972913 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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-12972913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12972313) 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, 30531 + ... + 30952.

It is an arithmetic number, because the mean of its divisors is an integer number (3258652).

Almost surely, 2^12972913 is an apocalyptic number.

It is an amenable number.

12972913 is a deficient number, since it is larger than the sum of its proper divisors (61695).

12972913 is an equidigital number, since it uses as much as digits as its factorization.

12972913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61694.

The product of its digits is 6804, while the sum is 34.

The square root of 12972913 is about 3601.7930257026. The cubic root of 12972913 is about 234.9700459784.

The spelling of 12972913 in words is "twelve million, nine hundred seventy-two thousand, nine hundred thirteen".