216895907 has 2 divisors, whose sum is σ = 216895908. Its totient is φ = 216895906.

The previous prime is 216895891. The next prime is 216895919. The reversal of 216895907 is 709598612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216895907 - 2⁴ = 216895891 is a prime.

It is not a weakly prime, because it can be changed into another prime (216895927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108447953 + 108447954.

It is an arithmetic number, because the mean of its divisors is an integer number (108447954).

Almost surely, 2^216895907 is an apocalyptic number.

216895907 is a deficient number, since it is larger than the sum of its proper divisors (1).

216895907 is an equidigital number, since it uses as much as digits as its factorization.

216895907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 216895907 is about 14727.3862922108. The cubic root of 216895907 is about 600.8283992499.

The spelling of 216895907 in words is "two hundred sixteen million, eight hundred ninety-five thousand, nine hundred seven".