72785591231 has 2 divisors, whose sum is σ = 72785591232. Its totient is φ = 72785591230.

The previous prime is 72785591149. The next prime is 72785591287. The reversal of 72785591231 is 13219558727.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72785591231 - 2¹⁸ = 72785329087 is a prime.

It is a super-2 number, since 2×72785591231² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72785591231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72785591731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36392795615 + 36392795616.

It is an arithmetic number, because the mean of its divisors is an integer number (36392795616).

Almost surely, 2^72785591231 is an apocalyptic number.

72785591231 is a deficient number, since it is larger than the sum of its proper divisors (1).

72785591231 is an equidigital number, since it uses as much as digits as its factorization.

72785591231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 50.

The spelling of 72785591231 in words is "seventy-two billion, seven hundred eighty-five million, five hundred ninety-one thousand, two hundred thirty-one".