215155243 has 8 divisors (see below), whose sum is σ = 216936720. Its totient is φ = 213380640.

The previous prime is 215155207. The next prime is 215155253. The reversal of 215155243 is 342551512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215155243 - 2²¹ = 213058091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215155253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74421 + ... + 77257.

It is an arithmetic number, because the mean of its divisors is an integer number (27117090).

Almost surely, 2^215155243 is an apocalyptic number.

215155243 is a deficient number, since it is larger than the sum of its proper divisors (1781477).

215155243 is a wasteful number, since it uses less digits than its factorization.

215155243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3437.

The product of its digits is 6000, while the sum is 28.

The square root of 215155243 is about 14668.1710857216. The cubic root of 215155243 is about 599.2167956891.

The spelling of 215155243 in words is "two hundred fifteen million, one hundred fifty-five thousand, two hundred forty-three".