255540431 has 16 divisors (see below), whose sum is σ = 271641600. Its totient is φ = 240021600.

The previous prime is 255540427. The next prime is 255540491. The reversal of 255540431 is 134045552.

It is a cyclic number.

It is not a de Polignac number, because 255540431 - 2² = 255540427 is a prime.

It is a super-2 number, since 2×255540431² = 130601823751331522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 255540394 and 255540403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255540421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161876 + ... + 163446.

It is an arithmetic number, because the mean of its divisors is an integer number (16977600).

Almost surely, 2^255540431 is an apocalyptic number.

255540431 is a deficient number, since it is larger than the sum of its proper divisors (16101169).

255540431 is a wasteful number, since it uses less digits than its factorization.

255540431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 255540431 is about 15985.6320175337. The cubic root of 255540431 is about 634.5802346973.

Adding to 255540431 its reverse (134045552), we get a palindrome (389585983).

The spelling of 255540431 in words is "two hundred fifty-five million, five hundred forty thousand, four hundred thirty-one".