722588161 has 3 divisors (see below), whose sum is σ = 722615043. Its totient is φ = 722561280.

The previous prime is 722588159. The next prime is 722588177. The reversal of 722588161 is 161885227.

The square root of 722588161 is 26881.

It is a perfect power (a square), and thus also a powerful number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 161885227 = 7 ⋅23126461.

It can be written as a sum of positive squares in only one way, i.e., 560789761 + 161798400 = 23681^2 + 12720^2 .

It is not a de Polignac number, because 722588161 - 2¹ = 722588159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722588561) 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 2 ways as a sum of consecutive naturals, for example, 13441 + ... + 40321.

It is an arithmetic number, because the mean of its divisors is an integer number (240871681).

Almost surely, 2^722588161 is an apocalyptic number.

722588161 is the 26881-st square number.

722588161 is the 13441-st centered octagonal number.

It is an amenable number.

722588161 is a deficient number, since it is larger than the sum of its proper divisors (26882).

722588161 is an frugal number, since it uses more digits than its factorization.

722588161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53762 (or 26881 counting only the distinct ones).

The product of its digits is 53760, while the sum is 40.

The cubic root of 722588161 is about 897.3536092166.

The spelling of 722588161 in words is "seven hundred twenty-two million, five hundred eighty-eight thousand, one hundred sixty-one".