18519049 has 2 divisors, whose sum is σ = 18519050. Its totient is φ = 18519048.

The previous prime is 18519041. The next prime is 18519107. The reversal of 18519049 is 94091581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17808400 + 710649 = 4220^2 + 843^2 .

It is a cyclic number.

It is not a de Polignac number, because 18519049 - 2³ = 18519041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18518999 and 18519017.

It is not a weakly prime, because it can be changed into another prime (18519041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9259524 + 9259525.

It is an arithmetic number, because the mean of its divisors is an integer number (9259525).

Almost surely, 2^18519049 is an apocalyptic number.

It is an amenable number.

18519049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18519049 is an equidigital number, since it uses as much as digits as its factorization.

18519049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 18519049 is about 4303.3764650562. The cubic root of 18519049 is about 264.5693682312.

The spelling of 18519049 in words is "eighteen million, five hundred nineteen thousand, forty-nine".