216969983 has 2 divisors, whose sum is σ = 216969984. Its totient is φ = 216969982.

The previous prime is 216969953. The next prime is 216970049. The reversal of 216969983 is 389969612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216969983 - 2¹² = 216965887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216969913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108484991 + 108484992.

It is an arithmetic number, because the mean of its divisors is an integer number (108484992).

Almost surely, 2^216969983 is an apocalyptic number.

216969983 is a deficient number, since it is larger than the sum of its proper divisors (1).

216969983 is an equidigital number, since it uses as much as digits as its factorization.

216969983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712, while the sum is 53.

The square root of 216969983 is about 14729.9009840528. The cubic root of 216969983 is about 600.8967913484.

The spelling of 216969983 in words is "two hundred sixteen million, nine hundred sixty-nine thousand, nine hundred eighty-three".