216982093 has 2 divisors, whose sum is σ = 216982094. Its totient is φ = 216982092.

The previous prime is 216982091. The next prime is 216982099. The reversal of 216982093 is 390289612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130919364 + 86062729 = 11442^2 + 9277^2 .

It is a cyclic number.

It is not a de Polignac number, because 216982093 - 2¹ = 216982091 is a prime.

Together with 216982091, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216982091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108491046 + 108491047.

It is an arithmetic number, because the mean of its divisors is an integer number (108491047).

Almost surely, 2^216982093 is an apocalyptic number.

It is an amenable number.

216982093 is a deficient number, since it is larger than the sum of its proper divisors (1).

216982093 is an equidigital number, since it uses as much as digits as its factorization.

216982093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 216982093 is about 14730.3120469323. The cubic root of 216982093 is about 600.9079706594.

The spelling of 216982093 in words is "two hundred sixteen million, nine hundred eighty-two thousand, ninety-three".