255540231 has 8 divisors (see below), whose sum is σ = 378578160. Its totient is φ = 170360136.

The previous prime is 255540193. The next prime is 255540239. The reversal of 255540231 is 132045552.

It is a happy number.

255540231 is a `hidden beast` number, since 255 + 5 + 402 + 3 + 1 = 666.

It is not a de Polignac number, because 255540231 - 2²⁷ = 121322503 is a prime.

It is a super-2 number, since 2×255540231² = 130601619319066722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 9464453 = 255540231 / (2 + 5 + 5 + 5 + 4 + 0 + 2 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 255540195 and 255540204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255540239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4732200 + ... + 4732253.

It is an arithmetic number, because the mean of its divisors is an integer number (47322270).

Almost surely, 2^255540231 is an apocalyptic number.

255540231 is a deficient number, since it is larger than the sum of its proper divisors (123037929).

255540231 is an equidigital number, since it uses as much as digits as its factorization.

255540231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9464462 (or 9464456 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 255540231 is about 15985.6257619150. The cubic root of 255540231 is about 634.5800691448.

Adding to 255540231 its reverse (132045552), we get a palindrome (387585783).

The spelling of 255540231 in words is "two hundred fifty-five million, five hundred forty thousand, two hundred thirty-one".