18510049 has 2 divisors, whose sum is σ = 18510050. Its totient is φ = 18510048.

The previous prime is 18510043. The next prime is 18510067. The reversal of 18510049 is 94001581.

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., 17164449 + 1345600 = 4143^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 18510049 - 2⁹ = 18509537 is a prime.

It is equal to p_1181755 and since 18510049 and 1181755 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 18509999 and 18510026.

It is not a weakly prime, because it can be changed into another prime (18510043) 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, 9255024 + 9255025.

It is an arithmetic number, because the mean of its divisors is an integer number (9255025).

Almost surely, 2^18510049 is an apocalyptic number.

It is an amenable number.

18510049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18510049 is an equidigital number, since it uses as much as digits as its factorization.

18510049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18510049 is about 4302.3306474514. The cubic root of 18510049 is about 264.5265022764.

The spelling of 18510049 in words is "eighteen million, five hundred ten thousand, forty-nine".