216913 has 4 divisors (see below), whose sum is σ = 226368. Its totient is φ = 207460.

The previous prime is 216911. The next prime is 216917. The reversal of 216913 is 319612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216913 - 2¹ = 216911 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4693 + ... + 4738.

It is an arithmetic number, because the mean of its divisors is an integer number (56592).

2²¹⁶⁹¹³ is an apocalyptic number.

216913 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

216913 is a deficient number, since it is larger than the sum of its proper divisors (9455).

216913 is an equidigital number, since it uses as much as digits as its factorization.

216913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9454.

The product of its digits is 324, while the sum is 22.

The square root of 216913 is about 465.7391974056. The cubic root of 216913 is about 60.0844182074.

The spelling of 216913 in words is "two hundred sixteen thousand, nine hundred thirteen".