18363109 has 2 divisors, whose sum is σ = 18363110. Its totient is φ = 18363108.

The previous prime is 18363089. The next prime is 18363127. The reversal of 18363109 is 90136381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13300609 + 5062500 = 3647^2 + 2250^2 .

It is an emirp because it is prime and its reverse (90136381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18363109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18363199) 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, 9181554 + 9181555.

It is an arithmetic number, because the mean of its divisors is an integer number (9181555).

Almost surely, 2^18363109 is an apocalyptic number.

It is an amenable number.

18363109 is a deficient number, since it is larger than the sum of its proper divisors (1).

18363109 is an equidigital number, since it uses as much as digits as its factorization.

18363109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 18363109 is about 4285.2198310005. The cubic root of 18363109 is about 263.8246702771.

The spelling of 18363109 in words is "eighteen million, three hundred sixty-three thousand, one hundred nine".