255331 has 4 divisors (see below), whose sum is σ = 256464. Its totient is φ = 254200.

The previous prime is 255329. The next prime is 255349. The reversal of 255331 is 133552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 255331 - 2¹ = 255329 is a prime.

It is a super-2 number, since 2×255331² = 130387839122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

255331 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 255299 and 255308.

It is not an unprimeable number, because it can be changed into a prime (255361) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 100 + ... + 721.

It is an arithmetic number, because the mean of its divisors is an integer number (64116).

2²⁵⁵³³¹ is an apocalyptic number.

255331 is a deficient number, since it is larger than the sum of its proper divisors (1133).

255331 is an equidigital number, since it uses as much as digits as its factorization.

255331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132.

The product of its digits is 450, while the sum is 19.

The square root of 255331 is about 505.3028794693. The cubic root of 255331 is about 63.4406828222.

Adding to 255331 its reverse (133552), we get a palindrome (388883).

It can be divided in two parts, 25 and 5331, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 255331 in words is "two hundred fifty-five thousand, three hundred thirty-one".