254781 has 6 divisors (see below), whose sum is σ = 368030. Its totient is φ = 169848.

The previous prime is 254777. The next prime is 254783. The reversal of 254781 is 187452.

It can be written as a sum of positive squares in only one way, i.e., 210681 + 44100 = 459^2 + 210^2 .

It is not a de Polignac number, because 254781 - 2² = 254777 is a prime.

It is a super-2 number, since 2×254781² = 129826715922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 254781.

It is not an unprimeable number, because it can be changed into a prime (254783) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14146 + ... + 14163.

2²⁵⁴⁷⁸¹ is an apocalyptic number.

It is an amenable number.

254781 is a deficient number, since it is larger than the sum of its proper divisors (113249).

254781 is a wasteful number, since it uses less digits than its factorization.

254781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28315 (or 28312 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 254781 is about 504.7583580289. The cubic root of 254781 is about 63.3950982554.

It can be divided in two parts, 2547 and 81, that added together give a triangular number (2628 = T₇₂).

The spelling of 254781 in words is "two hundred fifty-four thousand, seven hundred eighty-one".