557761 has 2 divisors, whose sum is σ = 557762. Its totient is φ = 557760.

The previous prime is 557759. The next prime is 557779. The reversal of 557761 is 167755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 553536 + 4225 = 744^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 557761 - 2¹ = 557759 is a prime.

It is a super-2 number, since 2×557761² = 622194666242, which contains 22 as substring.

Together with 557759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (557731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278880 + 278881.

It is an arithmetic number, because the mean of its divisors is an integer number (278881).

2⁵⁵⁷⁷⁶¹ is an apocalyptic number.

It is an amenable number.

557761 is a deficient number, since it is larger than the sum of its proper divisors (1).

557761 is an equidigital number, since it uses as much as digits as its factorization.

557761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7350, while the sum is 31.

The square root of 557761 is about 746.8339842294. The cubic root of 557761 is about 82.3157073879.

The spelling of 557761 in words is "five hundred fifty-seven thousand, seven hundred sixty-one".