557561 has 4 divisors (see below), whose sum is σ = 569472. Its totient is φ = 545652.

The previous prime is 557551. The next prime is 557567. The reversal of 557561 is 165755.

557561 is nontrivially palindromic in base 15.

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 an emirpimes, since its reverse is a distinct semiprime: 165755 = 5 ⋅33151.

It is a cyclic number.

It is not a de Polignac number, because 557561 - 2¹⁰ = 556537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (557567) 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, 5885 + ... + 5978.

It is an arithmetic number, because the mean of its divisors is an integer number (142368).

2⁵⁵⁷⁵⁶¹ is an apocalyptic number.

It is an amenable number.

557561 is a deficient number, since it is larger than the sum of its proper divisors (11911).

557561 is a wasteful number, since it uses less digits than its factorization.

557561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11910.

The product of its digits is 5250, while the sum is 29.

The square root of 557561 is about 746.7000736574. The cubic root of 557561 is about 82.3058673850.

The spelling of 557561 in words is "five hundred fifty-seven thousand, five hundred sixty-one".