2173508009 has 2 divisors, whose sum is σ = 2173508010. Its totient is φ = 2173508008.

The previous prime is 2173507967. The next prime is 2173508041. The reversal of 2173508009 is 9008053712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1904449600 + 269058409 = 43640^2 + 16403^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173508009 - 2⁸ = 2173507753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2173508009.

It is not a weakly prime, because it can be changed into another prime (2173507009) 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, 1086754004 + 1086754005.

It is an arithmetic number, because the mean of its divisors is an integer number (1086754005).

Almost surely, 2^2173508009 is an apocalyptic number.

It is an amenable number.

2173508009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173508009 is an equidigital number, since it uses as much as digits as its factorization.

2173508009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 2173508009 is about 46620.8966987981. The cubic root of 2173508009 is about 1295.3498573233.

The spelling of 2173508009 in words is "two billion, one hundred seventy-three million, five hundred eight thousand, nine".