557550091 has 4 divisors (see below), whose sum is σ = 637200112. Its totient is φ = 477900072.

The previous prime is 557550073. The next prime is 557550101. The reversal of 557550091 is 190055755.

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

It is a cyclic number.

It is not a de Polignac number, because 557550091 - 2⁷ = 557549963 is a prime.

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 557550091.

It is not an unprimeable number, because it can be changed into a prime (557550001) 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, 39825000 + ... + 39825013.

It is an arithmetic number, because the mean of its divisors is an integer number (159300028).

Almost surely, 2^557550091 is an apocalyptic number.

557550091 is a deficient number, since it is larger than the sum of its proper divisors (79650021).

557550091 is an equidigital number, since it uses as much as digits as its factorization.

557550091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79650020.

The product of its (nonzero) digits is 39375, while the sum is 37.

The square root of 557550091 is about 23612.4986183165. The cubic root of 557550091 is about 823.0533059435.

The spelling of 557550091 in words is "five hundred fifty-seven million, five hundred fifty thousand, ninety-one".