72190913 has 2 divisors, whose sum is σ = 72190914. Its totient is φ = 72190912.

The previous prime is 72190903. The next prime is 72190939. The reversal of 72190913 is 31909127.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64529089 + 7661824 = 8033^2 + 2768^2 .

It is a cyclic number.

It is not a de Polignac number, because 72190913 - 2⁴ = 72190897 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72190913.

It is not a weakly prime, because it can be changed into another prime (72190903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36095456 + 36095457.

It is an arithmetic number, because the mean of its divisors is an integer number (36095457).

Almost surely, 2^72190913 is an apocalyptic number.

It is an amenable number.

72190913 is a deficient number, since it is larger than the sum of its proper divisors (1).

72190913 is an equidigital number, since it uses as much as digits as its factorization.

72190913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 72190913 is about 8496.5235832074. The cubic root of 72190913 is about 416.3841392088.

The spelling of 72190913 in words is "seventy-two million, one hundred ninety thousand, nine hundred thirteen".