216804901 has 2 divisors, whose sum is σ = 216804902. Its totient is φ = 216804900.

The previous prime is 216804799. The next prime is 216804967. The reversal of 216804901 is 109408612.

It is a happy number.

216804901 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., 169676676 + 47128225 = 13026^2 + 6865^2 .

It is a cyclic number.

It is not a de Polignac number, because 216804901 - 2⁷ = 216804773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216804701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108402450 + 108402451.

It is an arithmetic number, because the mean of its divisors is an integer number (108402451).

Almost surely, 2^216804901 is an apocalyptic number.

It is an amenable number.

216804901 is a deficient number, since it is larger than the sum of its proper divisors (1).

216804901 is an equidigital number, since it uses as much as digits as its factorization.

216804901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 216804901 is about 14724.2962819960. The cubic root of 216804901 is about 600.7443548815.

The spelling of 216804901 in words is "two hundred sixteen million, eight hundred four thousand, nine hundred one".