217712983 has 2 divisors, whose sum is σ = 217712984. Its totient is φ = 217712982.

The previous prime is 217712981. The next prime is 217713047. The reversal of 217712983 is 389217712.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217712983 - 2¹ = 217712981 is a prime.

Together with 217712981, 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 (217712981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108856491 + 108856492.

It is an arithmetic number, because the mean of its divisors is an integer number (108856492).

Almost surely, 2^217712983 is an apocalyptic number.

217712983 is a deficient number, since it is larger than the sum of its proper divisors (1).

217712983 is an equidigital number, since it uses as much as digits as its factorization.

217712983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 217712983 is about 14755.1002368673. The cubic root of 217712983 is about 601.5819209153.

The spelling of 217712983 in words is "two hundred seventeen million, seven hundred twelve thousand, nine hundred eighty-three".