18649109 has 2 divisors, whose sum is σ = 18649110. Its totient is φ = 18649108.

The previous prime is 18649097. The next prime is 18649121. The reversal of 18649109 is 90194681.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (18649097) and next prime (18649121).

It can be written as a sum of positive squares in only one way, i.e., 18464209 + 184900 = 4297^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 18649109 - 2⁴ = 18649093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18649129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9324554 + 9324555.

It is an arithmetic number, because the mean of its divisors is an integer number (9324555).

Almost surely, 2^18649109 is an apocalyptic number.

It is an amenable number.

18649109 is a deficient number, since it is larger than the sum of its proper divisors (1).

18649109 is an equidigital number, since it uses as much as digits as its factorization.

18649109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 18649109 is about 4318.4614158286. The cubic root of 18649109 is about 265.1872842459.

The spelling of 18649109 in words is "eighteen million, six hundred forty-nine thousand, one hundred nine".