2195891543 has 2 divisors, whose sum is σ = 2195891544. Its totient is φ = 2195891542.

The previous prime is 2195891531. The next prime is 2195891623. The reversal of 2195891543 is 3451985912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2195891543 - 2⁴ = 2195891527 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2195891843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097945771 + 1097945772.

It is an arithmetic number, because the mean of its divisors is an integer number (1097945772).

Almost surely, 2^2195891543 is an apocalyptic number.

2195891543 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195891543 is an equidigital number, since it uses as much as digits as its factorization.

2195891543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 47.

The square root of 2195891543 is about 46860.3408331608. The cubic root of 2195891543 is about 1299.7813326490.

The spelling of 2195891543 in words is "two billion, one hundred ninety-five million, eight hundred ninety-one thousand, five hundred forty-three".