72431771 has 2 divisors, whose sum is σ = 72431772. Its totient is φ = 72431770.

The previous prime is 72431753. The next prime is 72431773. The reversal of 72431771 is 17713427.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72431771 - 2¹⁰ = 72430747 is a prime.

It is a super-2 number, since 2×72431771² = 10492722900392882, which contains 22 as substring.

Together with 72431773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72431773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36215885 + 36215886.

It is an arithmetic number, because the mean of its divisors is an integer number (36215886).

Almost surely, 2^72431771 is an apocalyptic number.

72431771 is a deficient number, since it is larger than the sum of its proper divisors (1).

72431771 is an equidigital number, since it uses as much as digits as its factorization.

72431771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8232, while the sum is 32.

The square root of 72431771 is about 8510.6856950542. The cubic root of 72431771 is about 416.8467002975.

The spelling of 72431771 in words is "seventy-two million, four hundred thirty-one thousand, seven hundred seventy-one".