215364155 has 4 divisors (see below), whose sum is σ = 258436992. Its totient is φ = 172291320.

The previous prime is 215364139. The next prime is 215364169. The reversal of 215364155 is 551463512.

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

It is not a de Polignac number, because 215364155 - 2⁴ = 215364139 is a prime.

It is a Duffinian 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, 21536411 + ... + 21536420.

It is an arithmetic number, because the mean of its divisors is an integer number (64609248).

Almost surely, 2^215364155 is an apocalyptic number.

215364155 is a deficient number, since it is larger than the sum of its proper divisors (43072837).

215364155 is an equidigital number, since it uses as much as digits as its factorization.

215364155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43072836.

The product of its digits is 18000, while the sum is 32.

The square root of 215364155 is about 14675.2906274458. The cubic root of 215364155 is about 599.4106759811.

The spelling of 215364155 in words is "two hundred fifteen million, three hundred sixty-four thousand, one hundred fifty-five".