255557 has 4 divisors (see below), whose sum is σ = 258720.
Its totient is φ = 252396.
The previous prime is 255551. The next prime is 255571. The reversal of 255557 is 755552.
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 a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-255557 is a prime.
It is a Duffinian number.
It is a plaindrome in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (255551) 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, 1457 + ... + 1622.
It is an arithmetic number, because the mean of its divisors is an integer number (64680).
2255557 is an apocalyptic number.
It is an amenable number.
255557 is a deficient number, since it is larger than the sum of its proper divisors (3163).
255557 is an equidigital number, since it uses as much as digits as its factorization.
255557 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3162.
The product of its digits is 8750, while the sum is 29.
The square root of 255557 is about 505.5264582591.
The cubic root of 255557 is about 63.4593949595.
The spelling of 255557 in words is "two hundred fifty-five thousand, five hundred fifty-seven".