18517049 has 2 divisors, whose sum is σ = 18517050. Its totient is φ = 18517048.

The previous prime is 18517043. The next prime is 18517061. The reversal of 18517049 is 94071581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 2155024 = 4045^2 + 1468^2 .

It is a cyclic number.

It is not a de Polignac number, because 18517049 - 2⁴ = 18517033 is a prime.

It is a super-2 number, since 2×18517049² = 685762207336802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18517043) 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 as a sum of consecutive naturals, namely, 9258524 + 9258525.

It is an arithmetic number, because the mean of its divisors is an integer number (9258525).

Almost surely, 2^18517049 is an apocalyptic number.

It is an amenable number.

18517049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18517049 is an equidigital number, since it uses as much as digits as its factorization.

18517049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 18517049 is about 4303.1440831095. The cubic root of 18517049 is about 264.5598436639.

The spelling of 18517049 in words is "eighteen million, five hundred seventeen thousand, forty-nine".