18289109 has 2 divisors, whose sum is σ = 18289110. Its totient is φ = 18289108.

The previous prime is 18289099. The next prime is 18289123. The reversal of 18289109 is 90198281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15382084 + 2907025 = 3922^2 + 1705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18289109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18289199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9144554 + 9144555.

It is an arithmetic number, because the mean of its divisors is an integer number (9144555).

Almost surely, 2^18289109 is an apocalyptic number.

It is an amenable number.

18289109 is a deficient number, since it is larger than the sum of its proper divisors (1).

18289109 is an equidigital number, since it uses as much as digits as its factorization.

18289109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 18289109 is about 4276.5767852337. The cubic root of 18289109 is about 263.4698046382.

The spelling of 18289109 in words is "eighteen million, two hundred eighty-nine thousand, one hundred nine".