557255991 has 8 divisors (see below), whose sum is σ = 743780224. Its totient is φ = 371117880.

The previous prime is 557255989. The next prime is 557255999. The reversal of 557255991 is 199552755.

557255991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 557255991 - 2¹ = 557255989 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 557255991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557255999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93145 + ... + 98946.

It is an arithmetic number, because the mean of its divisors is an integer number (92972528).

Almost surely, 2^557255991 is an apocalyptic number.

557255991 is a deficient number, since it is larger than the sum of its proper divisors (186524233).

557255991 is a wasteful number, since it uses less digits than its factorization.

557255991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193061.

The product of its digits is 708750, while the sum is 48.

The square root of 557255991 is about 23606.2701628190. The cubic root of 557255991 is about 822.9085640600.

It can be divided in two parts, 55725 and 5991, that added together give a palindrome (61716).

The spelling of 557255991 in words is "five hundred fifty-seven million, two hundred fifty-five thousand, nine hundred ninety-one".