721613359 has 4 divisors (see below), whose sum is σ = 721695280. Its totient is φ = 721531440.

The previous prime is 721613353. The next prime is 721613377. The reversal of 721613359 is 953316127.

721613359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 721613359 - 2¹¹ = 721611311 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 (721613353) 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, 25902 + ... + 45979.

It is an arithmetic number, because the mean of its divisors is an integer number (180423820).

Almost surely, 2^721613359 is an apocalyptic number.

721613359 is a deficient number, since it is larger than the sum of its proper divisors (81921).

721613359 is a wasteful number, since it uses less digits than its factorization.

721613359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81920.

The product of its digits is 34020, while the sum is 37.

The square root of 721613359 is about 26862.8620775970. The cubic root of 721613359 is about 896.9499049630.

The spelling of 721613359 in words is "seven hundred twenty-one million, six hundred thirteen thousand, three hundred fifty-nine".