195811963 has 4 divisors (see below), whose sum is σ = 196160328. Its totient is φ = 195463600.

The previous prime is 195811943. The next prime is 195811969. The reversal of 195811963 is 369118591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 195811963 - 2²¹ = 193714811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195811969) 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 in 3 ways as a sum of consecutive naturals, for example, 173338 + ... + 174463.

It is an arithmetic number, because the mean of its divisors is an integer number (49040082).

Almost surely, 2^195811963 is an apocalyptic number.

195811963 is a deficient number, since it is larger than the sum of its proper divisors (348365).

195811963 is an equidigital number, since it uses as much as digits as its factorization.

195811963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348364.

The product of its digits is 58320, while the sum is 43.

The square root of 195811963 is about 13993.2827813919. The cubic root of 195811963 is about 580.6927542873.

The spelling of 195811963 in words is "one hundred ninety-five million, eight hundred eleven thousand, nine hundred sixty-three".