72571439 has 2 divisors, whose sum is σ = 72571440. Its totient is φ = 72571438.

The previous prime is 72571327. The next prime is 72571441. The reversal of 72571439 is 93417527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72571439 - 2⁸ = 72571183 is a prime.

It is a super-2 number, since 2×72571439² = 10533227517061442, which contains 22 as substring.

Together with 72571441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72571459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36285719 + 36285720.

It is an arithmetic number, because the mean of its divisors is an integer number (36285720).

Almost surely, 2^72571439 is an apocalyptic number.

72571439 is a deficient number, since it is larger than the sum of its proper divisors (1).

72571439 is an equidigital number, since it uses as much as digits as its factorization.

72571439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 72571439 is about 8518.8871925857. The cubic root of 72571439 is about 417.1144592417.

The spelling of 72571439 in words is "seventy-two million, five hundred seventy-one thousand, four hundred thirty-nine".