557121 has 4 divisors (see below), whose sum is σ = 742832. Its totient is φ = 371412.

The previous prime is 557093. The next prime is 557153. The reversal of 557121 is 121755.

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.

It is not a de Polignac number, because 557121 - 2⁶ = 557057 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (557021) 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, 92851 + ... + 92856.

It is an arithmetic number, because the mean of its divisors is an integer number (185708).

2⁵⁵⁷¹²¹ is an apocalyptic number.

It is an amenable number.

557121 is a deficient number, since it is larger than the sum of its proper divisors (185711).

557121 is a wasteful number, since it uses less digits than its factorization.

557121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185710.

The product of its digits is 350, while the sum is 21.

The square root of 557121 is about 746.4053858327. The cubic root of 557121 is about 82.2842110926.

Adding to 557121 its reverse (121755), we get a palindrome (678876).

The spelling of 557121 in words is "five hundred fifty-seven thousand, one hundred twenty-one".