557731 has 2 divisors, whose sum is σ = 557732. Its totient is φ = 557730.

The previous prime is 557729. The next prime is 557741. The reversal of 557731 is 137755.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 557731 - 2¹ = 557729 is a prime.

It is a super-2 number, since 2×557731² = 622127736722, which contains 22 as substring.

Together with 557729, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 557731.

It is not a weakly prime, because it can be changed into another prime (557741) 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 as a sum of consecutive naturals, namely, 278865 + 278866.

It is an arithmetic number, because the mean of its divisors is an integer number (278866).

2⁵⁵⁷⁷³¹ is an apocalyptic number.

557731 is a deficient number, since it is larger than the sum of its proper divisors (1).

557731 is an equidigital number, since it uses as much as digits as its factorization.

557731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3675, while the sum is 28.

The square root of 557731 is about 746.8138991744. The cubic root of 557731 is about 82.3142315374.

The spelling of 557731 in words is "five hundred fifty-seven thousand, seven hundred thirty-one".