18147089 has 2 divisors, whose sum is σ = 18147090. Its totient is φ = 18147088.

The previous prime is 18147053. The next prime is 18147119. The reversal of 18147089 is 98074181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11937025 + 6210064 = 3455^2 + 2492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18147089 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18147589) 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, 9073544 + 9073545.

It is an arithmetic number, because the mean of its divisors is an integer number (9073545).

Almost surely, 2^18147089 is an apocalyptic number.

It is an amenable number.

18147089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18147089 is an equidigital number, since it uses as much as digits as its factorization.

18147089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18147089 is about 4259.9400230520. The cubic root of 18147089 is about 262.7860597325.

The spelling of 18147089 in words is "eighteen million, one hundred forty-seven thousand, eighty-nine".