2161292291 has 2 divisors, whose sum is σ = 2161292292. Its totient is φ = 2161292290.

The previous prime is 2161292279. The next prime is 2161292293. The reversal of 2161292291 is 1922921612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161292291 is a prime.

Together with 2161292293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2161292293) 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, 1080646145 + 1080646146.

It is an arithmetic number, because the mean of its divisors is an integer number (1080646146).

Almost surely, 2^2161292291 is an apocalyptic number.

2161292291 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161292291 is an equidigital number, since it uses as much as digits as its factorization.

2161292291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 2161292291 is about 46489.7009132130. The cubic root of 2161292291 is about 1292.9185548994.

The spelling of 2161292291 in words is "two billion, one hundred sixty-one million, two hundred ninety-two thousand, two hundred ninety-one".