18120049 has 2 divisors, whose sum is σ = 18120050. Its totient is φ = 18120048.

The previous prime is 18120023. The next prime is 18120059. The reversal of 18120049 is 94002181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14630625 + 3489424 = 3825^2 + 1868^2 .

It is a cyclic number.

It is not a de Polignac number, because 18120049 - 2⁷ = 18119921 is a prime.

It is not a weakly prime, because it can be changed into another prime (18120019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9060024 + 9060025.

It is an arithmetic number, because the mean of its divisors is an integer number (9060025).

Almost surely, 2^18120049 is an apocalyptic number.

It is an amenable number.

18120049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18120049 is an equidigital number, since it uses as much as digits as its factorization.

18120049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 18120049 is about 4256.7650863067. The cubic root of 18120049 is about 262.6554737329.

The spelling of 18120049 in words is "eighteen million, one hundred twenty thousand, forty-nine".