217883971 has 2 divisors, whose sum is σ = 217883972. Its totient is φ = 217883970.

The previous prime is 217883947. The next prime is 217883977. The reversal of 217883971 is 179388712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217883971 - 2²⁷ = 83666243 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (217883977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108941985 + 108941986.

It is an arithmetic number, because the mean of its divisors is an integer number (108941986).

Almost surely, 2^217883971 is an apocalyptic number.

217883971 is a deficient number, since it is larger than the sum of its proper divisors (1).

217883971 is an equidigital number, since it uses as much as digits as its factorization.

217883971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 46.

The square root of 217883971 is about 14760.8932995263. The cubic root of 217883971 is about 601.7393703713.

The spelling of 217883971 in words is "two hundred seventeen million, eight hundred eighty-three thousand, nine hundred seventy-one".