2195861399 has 2 divisors, whose sum is σ = 2195861400. Its totient is φ = 2195861398.

The previous prime is 2195861377. The next prime is 2195861443. The reversal of 2195861399 is 9931685912.

It is a happy number.

2195861399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2195861399 - 2¹⁶ = 2195795863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2195861399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2195861329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097930699 + 1097930700.

It is an arithmetic number, because the mean of its divisors is an integer number (1097930700).

Almost surely, 2^2195861399 is an apocalyptic number.

2195861399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195861399 is an equidigital number, since it uses as much as digits as its factorization.

2195861399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 53.

The square root of 2195861399 is about 46860.0191954720. The cubic root of 2195861399 is about 1299.7753850590.

The spelling of 2195861399 in words is "two billion, one hundred ninety-five million, eight hundred sixty-one thousand, three hundred ninety-nine".