255761 has 4 divisors (see below), whose sum is σ = 279024. Its totient is φ = 232500.

The previous prime is 255757. The next prime is 255763. The reversal of 255761 is 167552.

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 not a de Polignac number, because 255761 - 2² = 255757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 255761.

It is not an unprimeable number, because it can be changed into a prime (255763) 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, 11615 + ... + 11636.

It is an arithmetic number, because the mean of its divisors is an integer number (69756).

2²⁵⁵⁷⁶¹ is an apocalyptic number.

It is an amenable number.

255761 is a deficient number, since it is larger than the sum of its proper divisors (23263).

255761 is a wasteful number, since it uses less digits than its factorization.

255761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23262.

The product of its digits is 2100, while the sum is 26.

The square root of 255761 is about 505.7281878638. The cubic root of 255761 is about 63.4762760903.

Subtracting from 255761 its reverse (167552), we obtain a square (88209 = 297²).

The spelling of 255761 in words is "two hundred fifty-five thousand, seven hundred sixty-one".