18006617 has 2 divisors, whose sum is σ = 18006618. Its totient is φ = 18006616.

The previous prime is 18006613. The next prime is 18006643. The reversal of 18006617 is 71660081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12880921 + 5125696 = 3589^2 + 2264^2 .

It is a cyclic number.

It is not a de Polignac number, because 18006617 - 2² = 18006613 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18006617.

It is not a weakly prime, because it can be changed into another prime (18006613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9003308 + 9003309.

It is an arithmetic number, because the mean of its divisors is an integer number (9003309).

Almost surely, 2^18006617 is an apocalyptic number.

It is an amenable number.

18006617 is a deficient number, since it is larger than the sum of its proper divisors (1).

18006617 is an equidigital number, since it uses as much as digits as its factorization.

18006617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18006617 is about 4243.4204363933. The cubic root of 18006617 is about 262.1062492751.

Adding to 18006617 its reverse (71660081), we get a palindrome (89666698).

The spelling of 18006617 in words is "eighteen million, six thousand, six hundred seventeen".