722591 has 8 divisors (see below), whose sum is σ = 764640. Its totient is φ = 681472.

The previous prime is 722581. The next prime is 722599. The reversal of 722591 is 195227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 9-Lehmer number, since φ(722591) divides (722591-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 722591 - 2¹⁴ = 706207 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 722591.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 722591.

It is not an unprimeable number, because it can be changed into a prime (722599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1871 + ... + 2223.

It is an arithmetic number, because the mean of its divisors is an integer number (95580).

2⁷²²⁵⁹¹ is an apocalyptic number.

722591 is a deficient number, since it is larger than the sum of its proper divisors (42049).

722591 is a wasteful number, since it uses less digits than its factorization.

722591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its digits is 1260, while the sum is 26.

The square root of 722591 is about 850.0535277263. The cubic root of 722591 is about 89.7354784429.

The spelling of 722591 in words is "seven hundred twenty-two thousand, five hundred ninety-one".