72315811 has 2 divisors, whose sum is σ = 72315812. Its totient is φ = 72315810.

The previous prime is 72315791. The next prime is 72315823. The reversal of 72315811 is 11851327.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72315811 - 2⁵ = 72315779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72315811.

It is not a weakly prime, because it can be changed into another prime (72315011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36157905 + 36157906.

It is an arithmetic number, because the mean of its divisors is an integer number (36157906).

Almost surely, 2^72315811 is an apocalyptic number.

72315811 is a deficient number, since it is larger than the sum of its proper divisors (1).

72315811 is an equidigital number, since it uses as much as digits as its factorization.

72315811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 72315811 is about 8503.8703541388. The cubic root of 72315811 is about 416.6241305556.

The spelling of 72315811 in words is "seventy-two million, three hundred fifteen thousand, eight hundred eleven".