217150243 has 8 divisors (see below), whose sum is σ = 218811600. Its totient is φ = 215495520.

The previous prime is 217150229. The next prime is 217150247. The reversal of 217150243 is 342051712.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217150243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217150247) 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, 77853 + ... + 80593.

It is an arithmetic number, because the mean of its divisors is an integer number (27351450).

Almost surely, 2^217150243 is an apocalyptic number.

217150243 is a deficient number, since it is larger than the sum of its proper divisors (1661357).

217150243 is a wasteful number, since it uses less digits than its factorization.

217150243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3317.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 217150243 is about 14736.0185599775. The cubic root of 217150243 is about 601.0631548717.

The spelling of 217150243 in words is "two hundred seventeen million, one hundred fifty thousand, two hundred forty-three".