18102017 has 4 divisors (see below), whose sum is σ = 18122196. Its totient is φ = 18081840.

The previous prime is 18102013. The next prime is 18102023. The reversal of 18102017 is 71020181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6330256 + 11771761 = 2516^2 + 3431^2 .

It is a cyclic number.

It is not a de Polignac number, because 18102017 - 2² = 18102013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18102017.

It is not an unprimeable number, because it can be changed into a prime (18102013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8678 + ... + 10559.

It is an arithmetic number, because the mean of its divisors is an integer number (4530549).

Almost surely, 2^18102017 is an apocalyptic number.

It is an amenable number.

18102017 is a deficient number, since it is larger than the sum of its proper divisors (20179).

18102017 is an equidigital number, since it uses as much as digits as its factorization.

18102017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20178.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 18102017 is about 4254.6465188074. The cubic root of 18102017 is about 262.5683184235.

Adding to 18102017 its reverse (71020181), we get a palindrome (89122198).

It can be divided in two parts, 1 and 8102017, that added together give a palindrome (8102018).

The spelling of 18102017 in words is "eighteen million, one hundred two thousand, seventeen".