72231531593 has 16 divisors (see below), whose sum is σ = 79921719696. Its totient is φ = 64855848960.

The previous prime is 72231531571. The next prime is 72231531599. The reversal of 72231531593 is 39513513227.

It can be written as a sum of positive squares in 8 ways, for example, as 4929163264 + 67302368329 = 70208^2 + 259427^2 .

It is a cyclic number.

It is not a de Polignac number, because 72231531593 - 2⁶ = 72231531529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72231531593.

It is not an unprimeable number, because it can be changed into a prime (72231531599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21446 + ... + 380687.

It is an arithmetic number, because the mean of its divisors is an integer number (4995107481).

Almost surely, 2^72231531593 is an apocalyptic number.

It is an amenable number.

72231531593 is a deficient number, since it is larger than the sum of its proper divisors (7690188103).

72231531593 is a wasteful number, since it uses less digits than its factorization.

72231531593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402524.

The product of its digits is 170100, while the sum is 41.

The spelling of 72231531593 in words is "seventy-two billion, two hundred thirty-one million, five hundred thirty-one thousand, five hundred ninety-three".