2018173009 has 2 divisors, whose sum is σ = 2018173010. Its totient is φ = 2018173008.

The previous prime is 2018172977. The next prime is 2018173021. The reversal of 2018173009 is 9003718102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1315657984 + 702515025 = 36272^2 + 26505^2 .

It is a cyclic number.

It is not a de Polignac number, because 2018173009 - 2⁵ = 2018172977 is a prime.

It is a super-2 number, since 2×2018173009² = 8146044588512228162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2018173049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009086504 + 1009086505.

It is an arithmetic number, because the mean of its divisors is an integer number (1009086505).

Almost surely, 2^2018173009 is an apocalyptic number.

It is an amenable number.

2018173009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2018173009 is an equidigital number, since it uses as much as digits as its factorization.

2018173009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 2018173009 is about 44924.0805025545. The cubic root of 2018173009 is about 1263.7256423393.

The spelling of 2018173009 in words is "two billion, eighteen million, one hundred seventy-three thousand, nine".