255812217 has 16 divisors (see below), whose sum is σ = 353144832. Its totient is φ = 164543760.

The previous prime is 255812213. The next prime is 255812237. The reversal of 255812217 is 712218552.

It is not a de Polignac number, because 255812217 - 2² = 255812213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255812213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28308 + ... + 36234.

It is an arithmetic number, because the mean of its divisors is an integer number (22071552).

Almost surely, 2^255812217 is an apocalyptic number.

It is an amenable number.

255812217 is a deficient number, since it is larger than the sum of its proper divisors (97332615).

255812217 is a wasteful number, since it uses less digits than its factorization.

255812217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8308.

The product of its digits is 11200, while the sum is 33.

The square root of 255812217 is about 15994.1307047304. The cubic root of 255812217 is about 634.8051292006.

The spelling of 255812217 in words is "two hundred fifty-five million, eight hundred twelve thousand, two hundred seventeen".