557506813 has 4 divisors (see below), whose sum is σ = 557558848. Its totient is φ = 557454780.

The previous prime is 557506783. The next prime is 557506837. The reversal of 557506813 is 318605755.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 557506813 - 2²¹ = 555409661 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 (557506013) 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, 3381 + ... + 33562.

It is an arithmetic number, because the mean of its divisors is an integer number (139389712).

Almost surely, 2^557506813 is an apocalyptic number.

It is an amenable number.

557506813 is a deficient number, since it is larger than the sum of its proper divisors (52035).

557506813 is a wasteful number, since it uses less digits than its factorization.

557506813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52034.

The product of its (nonzero) digits is 126000, while the sum is 40.

The square root of 557506813 is about 23611.5821790917. The cubic root of 557506813 is about 823.0320097866.

The spelling of 557506813 in words is "five hundred fifty-seven million, five hundred six thousand, eight hundred thirteen".