557901989 has 4 divisors (see below), whose sum is σ = 565544556. Its totient is φ = 550259424.

The previous prime is 557901979. The next prime is 557902001. The reversal of 557901989 is 989109755.

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

It can be written as a sum of positive squares in 2 ways, for example, as 157301764 + 400600225 = 12542^2 + 20015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-557901989 is a prime.

It is a super-2 number, since 2×557901989² = 622509258660312242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 557901989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557901919) 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 in 3 ways as a sum of consecutive naturals, for example, 3821174 + ... + 3821319.

It is an arithmetic number, because the mean of its divisors is an integer number (141386139).

Almost surely, 2^557901989 is an apocalyptic number.

It is an amenable number.

557901989 is a deficient number, since it is larger than the sum of its proper divisors (7642567).

557901989 is an equidigital number, since it uses as much as digits as its factorization.

557901989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7642566.

The product of its (nonzero) digits is 1020600, while the sum is 53.

The square root of 557901989 is about 23619.9489626883. The cubic root of 557901989 is about 823.2264263529.

The spelling of 557901989 in words is "five hundred fifty-seven million, nine hundred one thousand, nine hundred eighty-nine".