72513923 has 2 divisors, whose sum is σ = 72513924. Its totient is φ = 72513922.

The previous prime is 72513887. The next prime is 72513941. The reversal of 72513923 is 32931527.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72513923 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72513923.

It is not a weakly prime, because it can be changed into another prime (72513983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36256961 + 36256962.

It is an arithmetic number, because the mean of its divisors is an integer number (36256962).

Almost surely, 2^72513923 is an apocalyptic number.

72513923 is a deficient number, since it is larger than the sum of its proper divisors (1).

72513923 is an equidigital number, since it uses as much as digits as its factorization.

72513923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 72513923 is about 8515.5107304260. The cubic root of 72513923 is about 417.0042363760.

The spelling of 72513923 in words is "seventy-two million, five hundred thirteen thousand, nine hundred twenty-three".