721972579 has 2 divisors, whose sum is σ = 721972580. Its totient is φ = 721972578.

The previous prime is 721972417. The next prime is 721972591. The reversal of 721972579 is 975279127.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721972579 is a prime.

It is a super-2 number, since 2×721972579² = 1042488809655822482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (721972079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360986289 + 360986290.

It is an arithmetic number, because the mean of its divisors is an integer number (360986290).

Almost surely, 2^721972579 is an apocalyptic number.

721972579 is a deficient number, since it is larger than the sum of its proper divisors (1).

721972579 is an equidigital number, since it uses as much as digits as its factorization.

721972579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 555660, while the sum is 49.

The square root of 721972579 is about 26869.5474282691. The cubic root of 721972579 is about 897.0987145211.

The spelling of 721972579 in words is "seven hundred twenty-one million, nine hundred seventy-two thousand, five hundred seventy-nine".