557293391 has 4 divisors (see below), whose sum is σ = 557429400. Its totient is φ = 557157384.

The previous prime is 557293367. The next prime is 557293397. The reversal of 557293391 is 193392755.

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 557293391 - 2⁶ = 557293327 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557293397) 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, 61661 + ... + 70118.

It is an arithmetic number, because the mean of its divisors is an integer number (139357350).

Almost surely, 2^557293391 is an apocalyptic number.

557293391 is a deficient number, since it is larger than the sum of its proper divisors (136009).

557293391 is a wasteful number, since it uses less digits than its factorization.

557293391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136008.

The product of its digits is 255150, while the sum is 44.

The square root of 557293391 is about 23607.0623119439. The cubic root of 557293391 is about 822.9269733682.

The spelling of 557293391 in words is "five hundred fifty-seven million, two hundred ninety-three thousand, three hundred ninety-one".