72108913 has 2 divisors, whose sum is σ = 72108914. Its totient is φ = 72108912.

The previous prime is 72108871. The next prime is 72108923. The reversal of 72108913 is 31980127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51022449 + 21086464 = 7143^2 + 4592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72108913 is a prime.

It is equal to p_4234729 and since 72108913 and 4234729 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (72108923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36054456 + 36054457.

It is an arithmetic number, because the mean of its divisors is an integer number (36054457).

Almost surely, 2^72108913 is an apocalyptic number.

It is an amenable number.

72108913 is a deficient number, since it is larger than the sum of its proper divisors (1).

72108913 is an equidigital number, since it uses as much as digits as its factorization.

72108913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 72108913 is about 8491.6967091389. The cubic root of 72108913 is about 416.2264257527.

The spelling of 72108913 in words is "seventy-two million, one hundred eight thousand, nine hundred thirteen".