72523691 has 2 divisors, whose sum is σ = 72523692. Its totient is φ = 72523690.

The previous prime is 72523651. The next prime is 72523723. The reversal of 72523691 is 19632527.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72523691 is a prime.

It is not a weakly prime, because it can be changed into another prime (72523631) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36261845 + 36261846.

It is an arithmetic number, because the mean of its divisors is an integer number (36261846).

Almost surely, 2^72523691 is an apocalyptic number.

72523691 is a deficient number, since it is larger than the sum of its proper divisors (1).

72523691 is an equidigital number, since it uses as much as digits as its factorization.

72523691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 35.

The square root of 72523691 is about 8516.0842527537. The cubic root of 72523691 is about 417.0229597435.

The spelling of 72523691 in words is "seventy-two million, five hundred twenty-three thousand, six hundred ninety-one".