255549999 has 16 divisors (see below), whose sum is σ = 344374272. Its totient is φ = 168556128.

The previous prime is 255549997. The next prime is 255550013. The reversal of 255549999 is 999945552.

It is not a de Polignac number, because 255549999 - 2¹ = 255549997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255549991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122842 + ... + 124904.

It is an arithmetic number, because the mean of its divisors is an integer number (21523392).

Almost surely, 2^255549999 is an apocalyptic number.

255549999 is a deficient number, since it is larger than the sum of its proper divisors (88824273).

255549999 is a wasteful number, since it uses less digits than its factorization.

255549999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486.

The product of its digits is 6561000, while the sum is 57.

The square root of 255549999 is about 15985.9312834755. The cubic root of 255549999 is about 634.5881546285.

It can be divided in two parts, 25554 and 9999, that added together give a palindrome (35553).

The spelling of 255549999 in words is "two hundred fifty-five million, five hundred forty-nine thousand, nine hundred ninety-nine".