16218133 has 2 divisors, whose sum is σ = 16218134. Its totient is φ = 16218132.

The previous prime is 16218127. The next prime is 16218157. The reversal of 16218133 is 33181261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11303044 + 4915089 = 3362^2 + 2217^2 .

It is a cyclic number.

It is not a de Polignac number, because 16218133 - 2⁵ = 16218101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16218098 and 16218107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16218733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8109066 + 8109067.

It is an arithmetic number, because the mean of its divisors is an integer number (8109067).

Almost surely, 2^16218133 is an apocalyptic number.

It is an amenable number.

16218133 is a deficient number, since it is larger than the sum of its proper divisors (1).

16218133 is an equidigital number, since it uses as much as digits as its factorization.

16218133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 16218133 is about 4027.1743195447. The cubic root of 16218133 is about 253.1241715768.

Adding to 16218133 its reverse (33181261), we get a palindrome (49399394).

The spelling of 16218133 in words is "sixteen million, two hundred eighteen thousand, one hundred thirty-three".