216443401 has 2 divisors, whose sum is σ = 216443402. Its totient is φ = 216443400.

The previous prime is 216443393. The next prime is 216443407. The reversal of 216443401 is 104344612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159365376 + 57078025 = 12624^2 + 7555^2 .

It is a cyclic number.

It is not a de Polignac number, because 216443401 - 2³ = 216443393 is a prime.

It is not a weakly prime, because it can be changed into another prime (216443407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108221700 + 108221701.

It is an arithmetic number, because the mean of its divisors is an integer number (108221701).

Almost surely, 2^216443401 is an apocalyptic number.

It is an amenable number.

216443401 is a deficient number, since it is larger than the sum of its proper divisors (1).

216443401 is an equidigital number, since it uses as much as digits as its factorization.

216443401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 216443401 is about 14712.0155315307. The cubic root of 216443401 is about 600.4102758737.

The spelling of 216443401 in words is "two hundred sixteen million, four hundred forty-three thousand, four hundred one".