721984519 has 2 divisors, whose sum is σ = 721984520. Its totient is φ = 721984518.

The previous prime is 721984511. The next prime is 721984573. The reversal of 721984519 is 915489127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721984519 - 2³ = 721984511 is a prime.

It is a super-2 number, since 2×721984519² = 1042523291351322722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721984511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360992259 + 360992260.

It is an arithmetic number, because the mean of its divisors is an integer number (360992260).

Almost surely, 2^721984519 is an apocalyptic number.

721984519 is a deficient number, since it is larger than the sum of its proper divisors (1).

721984519 is an equidigital number, since it uses as much as digits as its factorization.

721984519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 46.

The square root of 721984519 is about 26869.7696119636. The cubic root of 721984519 is about 897.1036599073.

The spelling of 721984519 in words is "seven hundred twenty-one million, nine hundred eighty-four thousand, five hundred nineteen".