2195187389 has 2 divisors, whose sum is σ = 2195187390. Its totient is φ = 2195187388.

The previous prime is 2195187331. The next prime is 2195187409. The reversal of 2195187389 is 9837815912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1362864889 + 832322500 = 36917^2 + 28850^2 .

It is a cyclic number.

It is not a de Polignac number, because 2195187389 - 2⁸ = 2195187133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2195187389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2195187889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097593694 + 1097593695.

It is an arithmetic number, because the mean of its divisors is an integer number (1097593695).

Almost surely, 2^2195187389 is an apocalyptic number.

It is an amenable number.

2195187389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195187389 is an equidigital number, since it uses as much as digits as its factorization.

2195187389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 53.

The square root of 2195187389 is about 46852.8269051079. The cubic root of 2195187389 is about 1299.6423846706.

The spelling of 2195187389 in words is "two billion, one hundred ninety-five million, one hundred eighty-seven thousand, three hundred eighty-nine".