72531863 has 2 divisors, whose sum is σ = 72531864. Its totient is φ = 72531862.

The previous prime is 72531817. The next prime is 72531869. The reversal of 72531863 is 36813527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72531863 - 2⁶ = 72531799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72531869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36265931 + 36265932.

It is an arithmetic number, because the mean of its divisors is an integer number (36265932).

Almost surely, 2^72531863 is an apocalyptic number.

72531863 is a deficient number, since it is larger than the sum of its proper divisors (1).

72531863 is an equidigital number, since it uses as much as digits as its factorization.

72531863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 72531863 is about 8516.5640372159. The cubic root of 72531863 is about 417.0386225961.

The spelling of 72531863 in words is "seventy-two million, five hundred thirty-one thousand, eight hundred sixty-three".