217158 has 16 divisors (see below), whose sum is σ = 460080. Its totient is φ = 68096.

The previous prime is 217157. The next prime is 217163. The reversal of 217158 is 851712.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 217158.

It is not an unprimeable number, because it can be changed into a prime (217157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 963 + ... + 1166.

It is an arithmetic number, because the mean of its divisors is an integer number (28755).

2²¹⁷¹⁵⁸ is an apocalyptic number.

217158 is an abundant number, since it is smaller than the sum of its proper divisors (242922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217158 is a wasteful number, since it uses less digits than its factorization.

217158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151.

The product of its digits is 560, while the sum is 24.

The square root of 217158 is about 466.0021459178. The cubic root of 217158 is about 60.1070311808.

The spelling of 217158 in words is "two hundred seventeen thousand, one hundred fifty-eight".