216995 has 4 divisors (see below), whose sum is σ = 260400. Its totient is φ = 173592.

The previous prime is 216991. The next prime is 217001. The reversal of 216995 is 599612.

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 216995 - 2² = 216991 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (216991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21695 + ... + 21704.

It is an arithmetic number, because the mean of its divisors is an integer number (65100).

2²¹⁶⁹⁹⁵ is an apocalyptic number.

216995 is a deficient number, since it is larger than the sum of its proper divisors (43405).

216995 is an equidigital number, since it uses as much as digits as its factorization.

216995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43404.

The product of its digits is 4860, while the sum is 32.

The square root of 216995 is about 465.8272211883. The cubic root of 216995 is about 60.0919885261.

The spelling of 216995 in words is "two hundred sixteen thousand, nine hundred ninety-five".