72312913 has 2 divisors, whose sum is σ = 72312914. Its totient is φ = 72312912.

The previous prime is 72312871. The next prime is 72312949. The reversal of 72312913 is 31921327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65173329 + 7139584 = 8073^2 + 2672^2 .

It is an emirp because it is prime and its reverse (31921327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72312913 - 2²⁵ = 38758481 is a prime.

It is not a weakly prime, because it can be changed into another prime (72312953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36156456 + 36156457.

It is an arithmetic number, because the mean of its divisors is an integer number (36156457).

Almost surely, 2^72312913 is an apocalyptic number.

It is an amenable number.

72312913 is a deficient number, since it is larger than the sum of its proper divisors (1).

72312913 is an equidigital number, since it uses as much as digits as its factorization.

72312913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 28.

The square root of 72312913 is about 8503.6999594294. The cubic root of 72312913 is about 416.6185651850.

The spelling of 72312913 in words is "seventy-two million, three hundred twelve thousand, nine hundred thirteen".