216951 has 8 divisors (see below), whose sum is σ = 330624. Its totient is φ = 123960.

The previous prime is 216947. The next prime is 216967. The reversal of 216951 is 159612.

216951 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 216951 - 2² = 216947 is a prime.

216951 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5145 + ... + 5186.

It is an arithmetic number, because the mean of its divisors is an integer number (41328).

2²¹⁶⁹⁵¹ is an apocalyptic number.

216951 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

216951 is a deficient number, since it is larger than the sum of its proper divisors (113673).

216951 is a wasteful number, since it uses less digits than its factorization.

216951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10341.

The product of its digits is 540, while the sum is 24.

The square root of 216951 is about 465.7799909829. The cubic root of 216951 is about 60.0879266410.

The spelling of 216951 in words is "two hundred sixteen thousand, nine hundred fifty-one".