215290255 has 4 divisors (see below), whose sum is σ = 258348312. Its totient is φ = 172232200.

The previous prime is 215290223. The next prime is 215290267. The reversal of 215290255 is 552092512.

215290255 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 215290255 - 2⁵ = 215290223 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 21529021 + ... + 21529030.

It is an arithmetic number, because the mean of its divisors is an integer number (64587078).

Almost surely, 2^215290255 is an apocalyptic number.

215290255 is a deficient number, since it is larger than the sum of its proper divisors (43058057).

215290255 is an equidigital number, since it uses as much as digits as its factorization.

215290255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43058056.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 215290255 is about 14672.7725737163. The cubic root of 215290255 is about 599.3421075967.

The spelling of 215290255 in words is "two hundred fifteen million, two hundred ninety thousand, two hundred fifty-five".