216983951 has 2 divisors, whose sum is σ = 216983952. Its totient is φ = 216983950.

The previous prime is 216983929. The next prime is 216983953. The reversal of 216983951 is 159389612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216983951 is a prime.

Together with 216983953, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216983953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108491975 + 108491976.

It is an arithmetic number, because the mean of its divisors is an integer number (108491976).

Almost surely, 2^216983951 is an apocalyptic number.

216983951 is a deficient number, since it is larger than the sum of its proper divisors (1).

216983951 is an equidigital number, since it uses as much as digits as its factorization.

216983951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 44.

The square root of 216983951 is about 14730.3751140288. The cubic root of 216983951 is about 600.9096858299.

The spelling of 216983951 in words is "two hundred sixteen million, nine hundred eighty-three thousand, nine hundred fifty-one".