18016949 has 2 divisors, whose sum is σ = 18016950. Its totient is φ = 18016948.

The previous prime is 18016927. The next prime is 18016951. The reversal of 18016949 is 94961081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12376324 + 5640625 = 3518^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 18016949 - 2¹² = 18012853 is a prime.

It is a super-2 number, since 2×18016949² = 649220902537202, which contains 22 as substring.

Together with 18016951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18016969) 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, 9008474 + 9008475.

It is an arithmetic number, because the mean of its divisors is an integer number (9008475).

Almost surely, 2^18016949 is an apocalyptic number.

It is an amenable number.

18016949 is a deficient number, since it is larger than the sum of its proper divisors (1).

18016949 is an equidigital number, since it uses as much as digits as its factorization.

18016949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 18016949 is about 4244.6376759389. The cubic root of 18016949 is about 262.1563709235.

The spelling of 18016949 in words is "eighteen million, sixteen thousand, nine hundred forty-nine".