216304001 has 4 divisors (see below), whose sum is σ = 216550404. Its totient is φ = 216057600.

The previous prime is 216303991. The next prime is 216304009. The reversal of 216304001 is 100403612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119793025 + 96510976 = 10945^2 + 9824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216304001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216304009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121880 + ... + 123641.

It is an arithmetic number, because the mean of its divisors is an integer number (54137601).

Almost surely, 2^216304001 is an apocalyptic number.

It is an amenable number.

216304001 is a deficient number, since it is larger than the sum of its proper divisors (246403).

216304001 is an equidigital number, since it uses as much as digits as its factorization.

216304001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246402.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 216304001 is about 14707.2771443255. The cubic root of 216304001 is about 600.2813504567.

Adding to 216304001 its reverse (100403612), we get a palindrome (316707613).

The spelling of 216304001 in words is "two hundred sixteen million, three hundred four thousand, one".