216501899 has 2 divisors, whose sum is σ = 216501900. Its totient is φ = 216501898.

The previous prime is 216501893. The next prime is 216501937. The reversal of 216501899 is 998105612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216501899 - 2⁸ = 216501643 is a prime.

It is not a weakly prime, because it can be changed into another prime (216501893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108250949 + 108250950.

It is an arithmetic number, because the mean of its divisors is an integer number (108250950).

Almost surely, 2^216501899 is an apocalyptic number.

216501899 is a deficient number, since it is larger than the sum of its proper divisors (1).

216501899 is an equidigital number, since it uses as much as digits as its factorization.

216501899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 216501899 is about 14714.0035000675. The cubic root of 216501899 is about 600.4643618171.

The spelling of 216501899 in words is "two hundred sixteen million, five hundred one thousand, eight hundred ninety-nine".