216478853 has 2 divisors, whose sum is σ = 216478854. Its totient is φ = 216478852.

The previous prime is 216478789. The next prime is 216478861. The reversal of 216478853 is 358874612.

216478853 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215707969 + 770884 = 14687^2 + 878^2 .

It is a cyclic number.

It is not a de Polignac number, because 216478853 - 2⁶ = 216478789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216468853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108239426 + 108239427.

It is an arithmetic number, because the mean of its divisors is an integer number (108239427).

Almost surely, 2^216478853 is an apocalyptic number.

It is an amenable number.

216478853 is a deficient number, since it is larger than the sum of its proper divisors (1).

216478853 is an equidigital number, since it uses as much as digits as its factorization.

216478853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 44.

The square root of 216478853 is about 14713.2203477009. The cubic root of 216478853 is about 600.4430551637.

The spelling of 216478853 in words is "two hundred sixteen million, four hundred seventy-eight thousand, eight hundred fifty-three".