557681 has 4 divisors (see below), whose sum is σ = 581952. Its totient is φ = 533412.

The previous prime is 557671. The next prime is 557693. The reversal of 557681 is 186755.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-557681 is a prime.

It is a super-2 number, since 2×557681² = 622016195522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 557681.

It is not an unprimeable number, because it can be changed into a prime (557611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12101 + ... + 12146.

It is an arithmetic number, because the mean of its divisors is an integer number (145488).

2⁵⁵⁷⁶⁸¹ is an apocalyptic number.

It is an amenable number.

557681 is a deficient number, since it is larger than the sum of its proper divisors (24271).

557681 is a wasteful number, since it uses less digits than its factorization.

557681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24270.

The product of its digits is 8400, while the sum is 32.

The square root of 557681 is about 746.7804228821. The cubic root of 557681 is about 82.3117716691.

The spelling of 557681 in words is "five hundred fifty-seven thousand, six hundred eighty-one".