2171603173 has 2 divisors, whose sum is σ = 2171603174. Its totient is φ = 2171603172.

The previous prime is 2171603153. The next prime is 2171603177. The reversal of 2171603173 is 3713061712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1870303009 + 301300164 = 43247^2 + 17358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2171603173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171603177) 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, 1085801586 + 1085801587.

It is an arithmetic number, because the mean of its divisors is an integer number (1085801587).

Almost surely, 2^2171603173 is an apocalyptic number.

It is an amenable number.

2171603173 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171603173 is an equidigital number, since it uses as much as digits as its factorization.

2171603173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 2171603173 is about 46600.4632273114. The cubic root of 2171603173 is about 1294.9713371016.

Adding to 2171603173 its reverse (3713061712), we get a palindrome (5884664885).

The spelling of 2171603173 in words is "two billion, one hundred seventy-one million, six hundred three thousand, one hundred seventy-three".