72313613 has 2 divisors, whose sum is σ = 72313614. Its totient is φ = 72313612.

The previous prime is 72313603. The next prime is 72313621. The reversal of 72313613 is 31631327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66945124 + 5368489 = 8182^2 + 2317^2 .

72313613 is a truncatable prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72313613 is a prime.

It is a super-2 number, since 2×72313613² = 10458517250227538, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72313603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36156806 + 36156807.

It is an arithmetic number, because the mean of its divisors is an integer number (36156807).

Almost surely, 2^72313613 is an apocalyptic number.

It is an amenable number.

72313613 is a deficient number, since it is larger than the sum of its proper divisors (1).

72313613 is an equidigital number, since it uses as much as digits as its factorization.

72313613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 26.

The square root of 72313613 is about 8503.7411178845. The cubic root of 72313613 is about 416.6199094910.

The spelling of 72313613 in words is "seventy-two million, three hundred thirteen thousand, six hundred thirteen".