557691 has 4 divisors (see below), whose sum is σ = 743592. Its totient is φ = 371792.

The previous prime is 557671. The next prime is 557693. The reversal of 557691 is 196755.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 557691 - 2¹⁹ = 33403 is a prime.

It is a super-2 number, since 2×557691² = 622038502962, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (557693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92946 + ... + 92951.

It is an arithmetic number, because the mean of its divisors is an integer number (185898).

2⁵⁵⁷⁶⁹¹ is an apocalyptic number.

557691 is a deficient number, since it is larger than the sum of its proper divisors (185901).

557691 is a wasteful number, since it uses less digits than its factorization.

557691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185900.

The product of its digits is 9450, while the sum is 33.

The square root of 557691 is about 746.7871182606. The cubic root of 557691 is about 82.3122636545.

The spelling of 557691 in words is "five hundred fifty-seven thousand, six hundred ninety-one".