216853423 has 2 divisors, whose sum is σ = 216853424. Its totient is φ = 216853422.

The previous prime is 216853409. The next prime is 216853471. The reversal of 216853423 is 324358612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216853423 - 2⁵ = 216853391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216853123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108426711 + 108426712.

It is an arithmetic number, because the mean of its divisors is an integer number (108426712).

Almost surely, 2^216853423 is an apocalyptic number.

216853423 is a deficient number, since it is larger than the sum of its proper divisors (1).

216853423 is an equidigital number, since it uses as much as digits as its factorization.

216853423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 34.

The square root of 216853423 is about 14725.9438746723. The cubic root of 216853423 is about 600.7891680494.

The spelling of 216853423 in words is "two hundred sixteen million, eight hundred fifty-three thousand, four hundred twenty-three".