255610217 has 4 divisors (see below), whose sum is σ = 255943380. Its totient is φ = 255277056.

The previous prime is 255610193. The next prime is 255610219. The reversal of 255610217 is 712016552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72522256 + 183087961 = 8516^2 + 13531^2 .

It is a cyclic number.

It is not a de Polignac number, because 255610217 - 2⁸ = 255609961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 255610217.

It is not an unprimeable number, because it can be changed into a prime (255610219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165428 + ... + 166965.

It is an arithmetic number, because the mean of its divisors is an integer number (63985845).

Almost surely, 2^255610217 is an apocalyptic number.

It is an amenable number.

255610217 is a deficient number, since it is larger than the sum of its proper divisors (333163).

255610217 is an equidigital number, since it uses as much as digits as its factorization.

255610217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333162.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 255610217 is about 15987.8146411572. The cubic root of 255610217 is about 634.6379956622.

Adding to 255610217 its reverse (712016552), we get a palindrome (967626769).

The spelling of 255610217 in words is "two hundred fifty-five million, six hundred ten thousand, two hundred seventeen".