2161707271 has 2 divisors, whose sum is σ = 2161707272. Its totient is φ = 2161707270.

The previous prime is 2161707263. The next prime is 2161707307. The reversal of 2161707271 is 1727071612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161707271 - 2³ = 2161707263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161707211) 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, 1080853635 + 1080853636.

It is an arithmetic number, because the mean of its divisors is an integer number (1080853636).

Almost surely, 2^2161707271 is an apocalyptic number.

2161707271 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161707271 is an equidigital number, since it uses as much as digits as its factorization.

2161707271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8232, while the sum is 34.

The square root of 2161707271 is about 46494.1638380561. The cubic root of 2161707271 is about 1293.0012987603.

Adding to 2161707271 its reverse (1727071612), we get a palindrome (3888778883).

The spelling of 2161707271 in words is "two billion, one hundred sixty-one million, seven hundred seven thousand, two hundred seventy-one".