209216983 has 2 divisors, whose sum is σ = 209216984. Its totient is φ = 209216982.

The previous prime is 209216971. The next prime is 209217053. The reversal of 209216983 is 389612902.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209216983 - 2⁵ = 209216951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209216963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104608491 + 104608492.

It is an arithmetic number, because the mean of its divisors is an integer number (104608492).

Almost surely, 2^209216983 is an apocalyptic number.

209216983 is a deficient number, since it is larger than the sum of its proper divisors (1).

209216983 is an equidigital number, since it uses as much as digits as its factorization.

209216983 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 209216983 is about 14464.3348619976. The cubic root of 209216983 is about 593.6525145510.

The spelling of 209216983 in words is "two hundred nine million, two hundred sixteen thousand, nine hundred eighty-three".