576721 has 2 divisors, whose sum is σ = 576722. Its totient is φ = 576720.

The previous prime is 576703. The next prime is 576727. The reversal of 576721 is 127675.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404496 + 172225 = 636^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 576721 - 2⁵ = 576689 is a prime.

It is a super-2 number, since 2×576721² = 665214223682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 576721.

It is not a weakly prime, because it can be changed into another prime (576727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 288360 + 288361.

It is an arithmetic number, because the mean of its divisors is an integer number (288361).

2⁵⁷⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

576721 is a deficient number, since it is larger than the sum of its proper divisors (1).

576721 is an equidigital number, since it uses as much as digits as its factorization.

576721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2940, while the sum is 28.

The square root of 576721 is about 759.4214903464. The cubic root of 576721 is about 83.2380546608.

The spelling of 576721 in words is "five hundred seventy-six thousand, seven hundred twenty-one".