216953897 has 2 divisors, whose sum is σ = 216953898. Its totient is φ = 216953896.

The previous prime is 216953861. The next prime is 216953899. The reversal of 216953897 is 798359612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125865961 + 91087936 = 11219^2 + 9544^2 .

It is a cyclic number.

It is not a de Polignac number, because 216953897 - 2¹⁸ = 216691753 is a prime.

Together with 216953899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216953899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108476948 + 108476949.

It is an arithmetic number, because the mean of its divisors is an integer number (108476949).

Almost surely, 2^216953897 is an apocalyptic number.

It is an amenable number.

216953897 is a deficient number, since it is larger than the sum of its proper divisors (1).

216953897 is an equidigital number, since it uses as much as digits as its factorization.

216953897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 50.

The square root of 216953897 is about 14729.3549417481. The cubic root of 216953897 is about 600.8819409614.

The spelling of 216953897 in words is "two hundred sixteen million, nine hundred fifty-three thousand, eight hundred ninety-seven".