557249191 has 4 divisors (see below), whose sum is σ = 557347392. Its totient is φ = 557150992.

The previous prime is 557249183. The next prime is 557249197. The reversal of 557249191 is 191942755.

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 557249191 - 2³ = 557249183 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 (557249197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40030 + ... + 52123.

It is an arithmetic number, because the mean of its divisors is an integer number (139336848).

Almost surely, 2^557249191 is an apocalyptic number.

557249191 is a deficient number, since it is larger than the sum of its proper divisors (98201).

557249191 is an equidigital number, since it uses as much as digits as its factorization.

557249191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98200.

The product of its digits is 113400, while the sum is 43.

The square root of 557249191 is about 23606.1261328495. The cubic root of 557249191 is about 822.9052168246.

The spelling of 557249191 in words is "five hundred fifty-seven million, two hundred forty-nine thousand, one hundred ninety-one".