558721 has 2 divisors, whose sum is σ = 558722. Its totient is φ = 558720.

The previous prime is 558703. The next prime is 558731. The reversal of 558721 is 127855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 18496 = 735^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 558721 - 2⁹ = 558209 is a prime.

558721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 558721.

It is not a weakly prime, because it can be changed into another prime (558731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 279360 + 279361.

It is an arithmetic number, because the mean of its divisors is an integer number (279361).

2⁵⁵⁸⁷²¹ is an apocalyptic number.

It is an amenable number.

558721 is a deficient number, since it is larger than the sum of its proper divisors (1).

558721 is an equidigital number, since it uses as much as digits as its factorization.

558721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2800, while the sum is 28.

The square root of 558721 is about 747.4764210328. The cubic root of 558721 is about 82.3629066872.

The spelling of 558721 in words is "five hundred fifty-eight thousand, seven hundred twenty-one".