72531869 has 2 divisors, whose sum is σ = 72531870. Its totient is φ = 72531868.

The previous prime is 72531863. The next prime is 72531887. The reversal of 72531869 is 96813527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69939769 + 2592100 = 8363^2 + 1610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72531869 is a prime.

It is a super-2 number, since 2×72531869² = 10521744041266322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72531863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36265934 + 36265935.

It is an arithmetic number, because the mean of its divisors is an integer number (36265935).

Almost surely, 2^72531869 is an apocalyptic number.

It is an amenable number.

72531869 is a deficient number, since it is larger than the sum of its proper divisors (1).

72531869 is an equidigital number, since it uses as much as digits as its factorization.

72531869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 72531869 is about 8516.5643894707. The cubic root of 72531869 is about 417.0386340955.

The spelling of 72531869 in words is "seventy-two million, five hundred thirty-one thousand, eight hundred sixty-nine".