557391 has 4 divisors (see below), whose sum is σ = 743192. Its totient is φ = 371592.

The previous prime is 557377. The next prime is 557423. The reversal of 557391 is 193755.

It is a happy number.

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

It is not a de Polignac number, because 557391 - 2¹⁴ = 541007 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557321) 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, 92896 + ... + 92901.

It is an arithmetic number, because the mean of its divisors is an integer number (185798).

2⁵⁵⁷³⁹¹ is an apocalyptic number.

557391 is a deficient number, since it is larger than the sum of its proper divisors (185801).

557391 is a wasteful number, since it uses less digits than its factorization.

557391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185800.

The product of its digits is 4725, while the sum is 30.

The square root of 557391 is about 746.5862307865. The cubic root of 557391 is about 82.2975015322.

The spelling of 557391 in words is "five hundred fifty-seven thousand, three hundred ninety-one".