215255 has 4 divisors (see below), whose sum is σ = 258312. Its totient is φ = 172200.

The previous prime is 215249. The next prime is 215261. The reversal of 215255 is 552512.

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

It is an interprime number because it is at equal distance from previous prime (215249) and next prime (215261).

It is not a de Polignac number, because 215255 - 2⁴ = 215239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21521 + ... + 21530.

It is an arithmetic number, because the mean of its divisors is an integer number (64578).

2²¹⁵²⁵⁵ is an apocalyptic number.

215255 is a deficient number, since it is larger than the sum of its proper divisors (43057).

215255 is an equidigital number, since it uses as much as digits as its factorization.

215255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43056.

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

The square root of 215255 is about 463.9558168619. The cubic root of 215255 is about 59.9309390588.

Adding to 215255 its reverse (552512), we get a palindrome (767767).

The spelling of 215255 in words is "two hundred fifteen thousand, two hundred fifty-five".