18516049 has 2 divisors, whose sum is σ = 18516050. Its totient is φ = 18516048.

The previous prime is 18516041. The next prime is 18516059. The reversal of 18516049 is 94061581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18147600 + 368449 = 4260^2 + 607^2 .

It is a cyclic number.

It is not a de Polignac number, because 18516049 - 2³ = 18516041 is a prime.

It is not a weakly prime, because it can be changed into another prime (18516041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9258024 + 9258025.

It is an arithmetic number, because the mean of its divisors is an integer number (9258025).

Almost surely, 2^18516049 is an apocalyptic number.

It is an amenable number.

18516049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18516049 is an equidigital number, since it uses as much as digits as its factorization.

18516049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 18516049 is about 4303.0278874300. The cubic root of 18516049 is about 264.5550811230. Note that the first 3 decimals are identical.

The spelling of 18516049 in words is "eighteen million, five hundred sixteen thousand, forty-nine".