16218049 has 2 divisors, whose sum is σ = 16218050. Its totient is φ = 16218048.

The previous prime is 16218043. The next prime is 16218079. The reversal of 16218049 is 94081261.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16200625 + 17424 = 4025^2 + 132^2 .

It is an emirp because it is prime and its reverse (94081261) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16218049 is a prime.

It is a super-2 number, since 2×16218049² = 526050226732802, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16218049.

It is not a weakly prime, because it can be changed into another prime (16218043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8109024 + 8109025.

It is an arithmetic number, because the mean of its divisors is an integer number (8109025).

Almost surely, 2^16218049 is an apocalyptic number.

It is an amenable number.

16218049 is a deficient number, since it is larger than the sum of its proper divisors (1).

16218049 is an equidigital number, since it uses as much as digits as its factorization.

16218049 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 16218049 is about 4027.1638903824. The cubic root of 16218049 is about 253.1237345667.

The spelling of 16218049 in words is "sixteen million, two hundred eighteen thousand, forty-nine".