215153243 has 4 divisors (see below), whose sum is σ = 217057368. Its totient is φ = 213249120.

The previous prime is 215153227. The next prime is 215153251. The reversal of 215153243 is 342351512.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 215153243 - 2⁴ = 215153227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215153203) by changing a digit.

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, 951893 + ... + 952118.

It is an arithmetic number, because the mean of its divisors is an integer number (54264342).

Almost surely, 2^215153243 is an apocalyptic number.

215153243 is a deficient number, since it is larger than the sum of its proper divisors (1904125).

215153243 is a wasteful number, since it uses less digits than its factorization.

215153243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904124.

The product of its digits is 3600, while the sum is 26.

The square root of 215153243 is about 14668.1029107380. The cubic root of 215153243 is about 599.2149389874.

The spelling of 215153243 in words is "two hundred fifteen million, one hundred fifty-three thousand, two hundred forty-three".