557431 has 4 divisors (see below), whose sum is σ = 637072. Its totient is φ = 477792.

The previous prime is 557423. The next prime is 557443. The reversal of 557431 is 134755.

557431 = 193² + 194² + ... + 206².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134755 = 5 ⋅26951.

It is not a de Polignac number, because 557431 - 2³ = 557423 is a prime.

It is a super-2 number, since 2×557431² = 621458639522, which contains 22 as substring.

It is a Duffinian number.

557431 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 557396 and 557405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557461) 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, 39810 + ... + 39823.

It is an arithmetic number, because the mean of its divisors is an integer number (159268).

2⁵⁵⁷⁴³¹ is an apocalyptic number.

557431 is a deficient number, since it is larger than the sum of its proper divisors (79641).

557431 is an equidigital number, since it uses as much as digits as its factorization.

557431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79640.

The product of its digits is 2100, while the sum is 25.

The square root of 557431 is about 746.6130189060. The cubic root of 557431 is about 82.2994701212.

The spelling of 557431 in words is "five hundred fifty-seven thousand, four hundred thirty-one".