557551909 has 4 divisors (see below), whose sum is σ = 557617900. Its totient is φ = 557485920.

The previous prime is 557551871. The next prime is 557551913. The reversal of 557551909 is 909155755.

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 325080900 + 232471009 = 18030^2 + 15247^2 .

It is a cyclic number.

It is not a de Polignac number, because 557551909 - 2²⁹ = 20680997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557551609) 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 in 3 ways as a sum of consecutive naturals, for example, 18072 + ... + 37969.

It is an arithmetic number, because the mean of its divisors is an integer number (139404475).

Almost surely, 2^557551909 is an apocalyptic number.

It is an amenable number.

557551909 is a deficient number, since it is larger than the sum of its proper divisors (65991).

557551909 is an equidigital number, since it uses as much as digits as its factorization.

557551909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65990.

The product of its (nonzero) digits is 354375, while the sum is 46.

The square root of 557551909 is about 23612.5371148464. The cubic root of 557551909 is about 823.0542005174.

The spelling of 557551909 in words is "five hundred fifty-seven million, five hundred fifty-one thousand, nine hundred nine".