557981 has 2 divisors, whose sum is σ = 557982. Its totient is φ = 557980.

The previous prime is 557927. The next prime is 557987. The reversal of 557981 is 189755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401956 + 156025 = 634^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 557981 - 2¹⁰ = 556957 is a prime.

It is a super-2 number, since 2×557981² = 622685592722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 557981.

It is not a weakly prime, because it can be changed into another prime (557987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278990 + 278991.

It is an arithmetic number, because the mean of its divisors is an integer number (278991).

2⁵⁵⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

557981 is a deficient number, since it is larger than the sum of its proper divisors (1).

557981 is an equidigital number, since it uses as much as digits as its factorization.

557981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 35.

The square root of 557981 is about 746.9812581317. The cubic root of 557981 is about 82.3265286747.

The spelling of 557981 in words is "five hundred fifty-seven thousand, nine hundred eighty-one".