721311359 has 4 divisors (see below), whose sum is σ = 726991104. Its totient is φ = 715631616.

The previous prime is 721311323. The next prime is 721311373. The reversal of 721311359 is 953113127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 953113127 = 419 ⋅2274733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721311359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721311389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2839682 + ... + 2839935.

It is an arithmetic number, because the mean of its divisors is an integer number (181747776).

Almost surely, 2^721311359 is an apocalyptic number.

721311359 is a deficient number, since it is larger than the sum of its proper divisors (5679745).

721311359 is a wasteful number, since it uses less digits than its factorization.

721311359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5679744.

The product of its digits is 5670, while the sum is 32.

The square root of 721311359 is about 26857.2403459477. The cubic root of 721311359 is about 896.8247609991.

The spelling of 721311359 in words is "seven hundred twenty-one million, three hundred eleven thousand, three hundred fifty-nine".