581726161 has 9 divisors (see below), whose sum is σ = 590514843. Its totient is φ = 573067440.

The previous prime is 581726149. The next prime is 581726177. The reversal of 581726161 is 161627185.

The square root of 581726161 is 24119.

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

It can be written as a sum of positive squares in only one way, i.e., 111703761 + 470022400 = 10569^2 + 21680^2 .

It is not a de Polignac number, because 581726161 - 2²¹ = 579629009 is a prime.

It is a super-3 number, since 3×581726161³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

Its product of digits (20160) is a multiple of the sum of its prime divisors (360).

It is a self number, because there is not a number n which added to its sum of digits gives 581726161.

It is not an unprimeable number, because it can be changed into a prime (581726261) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2146456 + ... + 2146726.

Almost surely, 2^581726161 is an apocalyptic number.

581726161 is the 24119-th square number.

581726161 is the 12060-th centered octagonal number.

It is an amenable number.

581726161 is a deficient number, since it is larger than the sum of its proper divisors (8788682).

581726161 is an frugal number, since it uses more digits than its factorization.

581726161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 360 counting only the distinct ones).

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

The cubic root of 581726161 is about 834.7815944252.

The spelling of 581726161 in words is "five hundred eighty-one million, seven hundred twenty-six thousand, one hundred sixty-one".