2171162065 has 4 divisors (see below), whose sum is σ = 2605394484. Its totient is φ = 1736929648.

The previous prime is 2171162051. The next prime is 2171162087. The reversal of 2171162065 is 5602611712.

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 1310150416 + 861011649 = 36196^2 + 29343^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171162065 - 2¹⁷ = 2171030993 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217116202 + ... + 217116211.

It is an arithmetic number, because the mean of its divisors is an integer number (651348621).

Almost surely, 2^2171162065 is an apocalyptic number.

It is an amenable number.

2171162065 is a deficient number, since it is larger than the sum of its proper divisors (434232419).

2171162065 is an equidigital number, since it uses as much as digits as its factorization.

2171162065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434232418.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 2171162065 is about 46595.7301155374. The cubic root of 2171162065 is about 1294.8836505935.

Adding to 2171162065 its reverse (5602611712), we get a palindrome (7773773777).

The spelling of 2171162065 in words is "two billion, one hundred seventy-one million, one hundred sixty-two thousand, sixty-five".