195961387 has 2 divisors, whose sum is σ = 195961388. Its totient is φ = 195961386.

The previous prime is 195961379. The next prime is 195961391. The reversal of 195961387 is 783169591.

195961387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (783169591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195961387 - 2³ = 195961379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195961387.

It is not a weakly prime, because it can be changed into another prime (195961327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97980693 + 97980694.

It is an arithmetic number, because the mean of its divisors is an integer number (97980694).

Almost surely, 2^195961387 is an apocalyptic number.

195961387 is a deficient number, since it is larger than the sum of its proper divisors (1).

195961387 is an equidigital number, since it uses as much as digits as its factorization.

195961387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 49.

The square root of 195961387 is about 13998.6208963598. The cubic root of 195961387 is about 580.8404255036.

The spelling of 195961387 in words is "one hundred ninety-five million, nine hundred sixty-one thousand, three hundred eighty-seven".