255801217 has 12 divisors (see below), whose sum is σ = 297843696. Its totient is φ = 219052680.

The previous prime is 255801191. The next prime is 255801223. The reversal of 255801217 is 712108552.

It is not a de Polignac number, because 255801217 - 2⁷ = 255801089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255801277) 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 11 ways as a sum of consecutive naturals, for example, 75318 + ... + 78640.

It is an arithmetic number, because the mean of its divisors is an integer number (24820308).

Almost surely, 2^255801217 is an apocalyptic number.

It is an amenable number.

255801217 is a deficient number, since it is larger than the sum of its proper divisors (42042479).

255801217 is a wasteful number, since it uses less digits than its factorization.

255801217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4908 (or 4901 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 255801217 is about 15993.7868248892. The cubic root of 255801217 is about 634.7960301349.

Adding to 255801217 its reverse (712108552), we get a palindrome (967909769).

The spelling of 255801217 in words is "two hundred fifty-five million, eight hundred one thousand, two hundred seventeen".