255531 has 8 divisors (see below), whose sum is σ = 358720. Its totient is φ = 161352.
The previous prime is 255523. The next prime is 255551. The reversal of 255531 is 135552.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 255531 - 23 = 255523 is a prime.
It is a super-2 number, since 2×2555312 = 130592183922, which contains 22 as substring.
It is a d-powerful number, because it can be written as 27 + 5 + 53 + 57 + 311 + 1 .
It is the 506-th Hogben number.
255531 is a lucky number.
It is a junction number, because it is equal to n+sod(n) for n = 255498 and 255507.
It is not an unprimeable number, because it can be changed into a prime (255511) by changing a digit.
It is a nontrivial repunit in base 505.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2185 + ... + 2298.
It is an arithmetic number, because the mean of its divisors is an integer number (44840).
2255531 is an apocalyptic number.
255531 is a deficient number, since it is larger than the sum of its proper divisors (103189).
255531 is a wasteful number, since it uses less digits than its factorization.
255531 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4505.
The product of its digits is 750, while the sum is 21.
The square root of 255531 is about 505.5007418392. The cubic root of 255531 is about 63.4572427975.
Adding to 255531 its sum of digits (21), we get a palindrome (255552).
The spelling of 255531 in words is "two hundred fifty-five thousand, five hundred thirty-one".
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