557291809 has 2 divisors, whose sum is σ = 557291810. Its totient is φ = 557291808.

The previous prime is 557291789. The next prime is 557291843. The reversal of 557291809 is 908192755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 498539584 + 58752225 = 22328^2 + 7665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-557291809 is a prime.

It is not a weakly prime, because it can be changed into another prime (557291209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278645904 + 278645905.

It is an arithmetic number, because the mean of its divisors is an integer number (278645905).

Almost surely, 2^557291809 is an apocalyptic number.

It is an amenable number.

557291809 is a deficient number, since it is larger than the sum of its proper divisors (1).

557291809 is an equidigital number, since it uses as much as digits as its factorization.

557291809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 46.

The square root of 557291809 is about 23607.0288049979. The cubic root of 557291809 is about 822.9261946810.

The spelling of 557291809 in words is "five hundred fifty-seven million, two hundred ninety-one thousand, eight hundred nine".