2561195171 has 2 divisors, whose sum is σ = 2561195172. Its totient is φ = 2561195170.

The previous prime is 2561195137. The next prime is 2561195173. The reversal of 2561195171 is 1715911652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2561195171 - 2³⁰ = 1487453347 is a prime.

Together with 2561195173, 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 (2561195173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280597585 + 1280597586.

It is an arithmetic number, because the mean of its divisors is an integer number (1280597586).

Almost surely, 2^2561195171 is an apocalyptic number.

2561195171 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561195171 is an equidigital number, since it uses as much as digits as its factorization.

2561195171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 38.

The square root of 2561195171 is about 50608.2520049843. The cubic root of 2561195171 is about 1368.1936110600.

The spelling of 2561195171 in words is "two billion, five hundred sixty-one million, one hundred ninety-five thousand, one hundred seventy-one".