255215 has 4 divisors (see below), whose sum is σ = 306264. Its totient is φ = 204168.

The previous prime is 255209. The next prime is 255217. The reversal of 255215 is 512552.

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

It is a cyclic number.

It is not a de Polignac number, because 255215 - 2⁸ = 254959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25517 + ... + 25526.

It is an arithmetic number, because the mean of its divisors is an integer number (76566).

2²⁵⁵²¹⁵ is an apocalyptic number.

255215 is a deficient number, since it is larger than the sum of its proper divisors (51049).

255215 is an equidigital number, since it uses as much as digits as its factorization.

255215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51048.

The product of its digits is 500, while the sum is 20.

The square root of 255215 is about 505.1880837866. The cubic root of 255215 is about 63.4310740739.

Adding to 255215 its reverse (512552), we get a palindrome (767767).

The spelling of 255215 in words is "two hundred fifty-five thousand, two hundred fifteen".