72731311 has 2 divisors, whose sum is σ = 72731312. Its totient is φ = 72731310.

The previous prime is 72731303. The next prime is 72731327. The reversal of 72731311 is 11313727.

It is a weak prime.

It is an emirp because it is prime and its reverse (11313727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72731311 - 2³ = 72731303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72731371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36365655 + 36365656.

It is an arithmetic number, because the mean of its divisors is an integer number (36365656).

Almost surely, 2^72731311 is an apocalyptic number.

72731311 is a deficient number, since it is larger than the sum of its proper divisors (1).

72731311 is an equidigital number, since it uses as much as digits as its factorization.

72731311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 882, while the sum is 25.

The square root of 72731311 is about 8528.2654156634. The cubic root of 72731311 is about 417.4205301309.

The spelling of 72731311 in words is "seventy-two million, seven hundred thirty-one thousand, three hundred eleven".