2171717161 has 4 divisors (see below), whose sum is σ = 2197882512. Its totient is φ = 2145551812.

The previous prime is 2171717153. The next prime is 2171717209. The reversal of 2171717161 is 1617171712.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2171717161 - 2³ = 2171717153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171717111) 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 in 3 ways as a sum of consecutive naturals, for example, 13082551 + ... + 13082716.

It is an arithmetic number, because the mean of its divisors is an integer number (549470628).

Almost surely, 2^2171717161 is an apocalyptic number.

It is an amenable number.

2171717161 is a deficient number, since it is larger than the sum of its proper divisors (26165351).

2171717161 is an equidigital number, since it uses as much as digits as its factorization.

2171717161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26165350.

The product of its digits is 4116, while the sum is 34.

The square root of 2171717161 is about 46601.6862463152. The cubic root of 2171717161 is about 1294.9939944962.

Adding to 2171717161 its reverse (1617171712), we get a palindrome (3788888873).

The spelling of 2171717161 in words is "two billion, one hundred seventy-one million, seven hundred seventeen thousand, one hundred sixty-one".