72517213 has 2 divisors, whose sum is σ = 72517214. Its totient is φ = 72517212.

The previous prime is 72517177. The next prime is 72517219. The reversal of 72517213 is 31271527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65318724 + 7198489 = 8082^2 + 2683^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72517213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72517219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36258606 + 36258607.

It is an arithmetic number, because the mean of its divisors is an integer number (36258607).

Almost surely, 2^72517213 is an apocalyptic number.

It is an amenable number.

72517213 is a deficient number, since it is larger than the sum of its proper divisors (1).

72517213 is an equidigital number, since it uses as much as digits as its factorization.

72517213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2940, while the sum is 28.

The square root of 72517213 is about 8515.7039051390. The cubic root of 72517213 is about 417.0105428577.

The spelling of 72517213 in words is "seventy-two million, five hundred seventeen thousand, two hundred thirteen".