557857831 has 2 divisors, whose sum is σ = 557857832. Its totient is φ = 557857830.

The previous prime is 557857829. The next prime is 557857837. The reversal of 557857831 is 138758755.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 557857831 - 2¹ = 557857829 is a prime.

It is a super-2 number, since 2×557857831² = 622410719216049122, which contains 22 as substring.

Together with 557857829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (557857837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278928915 + 278928916.

It is an arithmetic number, because the mean of its divisors is an integer number (278928916).

Almost surely, 2^557857831 is an apocalyptic number.

557857831 is a deficient number, since it is larger than the sum of its proper divisors (1).

557857831 is an equidigital number, since it uses as much as digits as its factorization.

557857831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1176000, while the sum is 49.

The square root of 557857831 is about 23619.0141834921. The cubic root of 557857831 is about 823.2047062943.

The spelling of 557857831 in words is "five hundred fifty-seven million, eight hundred fifty-seven thousand, eight hundred thirty-one".