722589121 has 4 divisors (see below), whose sum is σ = 736222932. Its totient is φ = 708955312.

The previous prime is 722589073. The next prime is 722589149. The reversal of 722589121 is 121985227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 202749121 + 519840000 = 14239^2 + 22800^2 .

It is a cyclic number.

It is not a de Polignac number, because 722589121 - 2¹⁷ = 722458049 is a prime.

It is a pancake number, because a pancake can be divided into 722589121 parts by 38015 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722589151) 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, 6816826 + ... + 6816931.

It is an arithmetic number, because the mean of its divisors is an integer number (184055733).

Almost surely, 2^722589121 is an apocalyptic number.

It is an amenable number.

722589121 is a deficient number, since it is larger than the sum of its proper divisors (13633811).

722589121 is a wasteful number, since it uses less digits than its factorization.

722589121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13633810.

The product of its digits is 20160, while the sum is 37.

The square root of 722589121 is about 26881.0178564726. The cubic root of 722589121 is about 897.3540066118.

The spelling of 722589121 in words is "seven hundred twenty-two million, five hundred eighty-nine thousand, one hundred twenty-one".