557097731 has 2 divisors, whose sum is σ = 557097732. Its totient is φ = 557097730.

The previous prime is 557097703. The next prime is 557097773. The reversal of 557097731 is 137790755.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-557097731 is a prime.

It is a super-2 number, since 2×557097731² = 620715763770696722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (557097131) 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, 278548865 + 278548866.

It is an arithmetic number, because the mean of its divisors is an integer number (278548866).

Almost surely, 2^557097731 is an apocalyptic number.

557097731 is a deficient number, since it is larger than the sum of its proper divisors (1).

557097731 is an equidigital number, since it uses as much as digits as its factorization.

557097731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 231525, while the sum is 44.

The square root of 557097731 is about 23602.9178492830. The cubic root of 557097731 is about 822.8306550187.

It can be divided in two parts, 5570 and 97731, that added together give a palindrome (103301).

The spelling of 557097731 in words is "five hundred fifty-seven million, ninety-seven thousand, seven hundred thirty-one".