216983929 has 2 divisors, whose sum is σ = 216983930. Its totient is φ = 216983928.

The previous prime is 216983867. The next prime is 216983951. The reversal of 216983929 is 929389612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194658304 + 22325625 = 13952^2 + 4725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216983929 is a prime.

It is not a weakly prime, because it can be changed into another prime (216983969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108491964 + 108491965.

It is an arithmetic number, because the mean of its divisors is an integer number (108491965).

Almost surely, 2^216983929 is an apocalyptic number.

It is an amenable number.

216983929 is a deficient number, since it is larger than the sum of its proper divisors (1).

216983929 is an equidigital number, since it uses as much as digits as its factorization.

216983929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 49.

The square root of 216983929 is about 14730.3743672725. The cubic root of 216983929 is about 600.9096655211.

The spelling of 216983929 in words is "two hundred sixteen million, nine hundred eighty-three thousand, nine hundred twenty-nine".