215252155 has 4 divisors (see below), whose sum is σ = 258302592. Its totient is φ = 172201720.

The previous prime is 215252143. The next prime is 215252171. The reversal of 215252155 is 551252512.

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

It is not a de Polignac number, because 215252155 - 2⁹ = 215251643 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21525211 + ... + 21525220.

It is an arithmetic number, because the mean of its divisors is an integer number (64575648).

Almost surely, 2^215252155 is an apocalyptic number.

215252155 is a deficient number, since it is larger than the sum of its proper divisors (43050437).

215252155 is an equidigital number, since it uses as much as digits as its factorization.

215252155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43050436.

The product of its digits is 5000, while the sum is 28.

The square root of 215252155 is about 14671.4741931409. The cubic root of 215252155 is about 599.3067502424.

The spelling of 215252155 in words is "two hundred fifteen million, two hundred fifty-two thousand, one hundred fifty-five".