18799549 has 2 divisors, whose sum is σ = 18799550. Its totient is φ = 18799548.

The previous prime is 18799523. The next prime is 18799601. The reversal of 18799549 is 94599781.

It is an a-pointer prime, because the next prime (18799601) can be obtained adding 18799549 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16867449 + 1932100 = 4107^2 + 1390^2 .

It is a cyclic number.

It is not a de Polignac number, because 18799549 - 2¹⁷ = 18668477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18799496 and 18799505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18799519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9399774 + 9399775.

It is an arithmetic number, because the mean of its divisors is an integer number (9399775).

Almost surely, 2^18799549 is an apocalyptic number.

It is an amenable number.

18799549 is a deficient number, since it is larger than the sum of its proper divisors (1).

18799549 is an equidigital number, since it uses as much as digits as its factorization.

18799549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 52.

The square root of 18799549 is about 4335.8446697270. The cubic root of 18799549 is about 265.8984527682.

The spelling of 18799549 in words is "eighteen million, seven hundred ninety-nine thousand, five hundred forty-nine".