195811961 has 4 divisors (see below), whose sum is σ = 197713152. Its totient is φ = 193910772.

The previous prime is 195811943. The next prime is 195811969. The reversal of 195811961 is 169118591.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 195811961 - 2⁶ = 195811897 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 950441 + ... + 950646.

It is an arithmetic number, because the mean of its divisors is an integer number (49428288).

Almost surely, 2^195811961 is an apocalyptic number.

It is an amenable number.

195811961 is a deficient number, since it is larger than the sum of its proper divisors (1901191).

195811961 is a wasteful number, since it uses less digits than its factorization.

195811961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901190.

The product of its digits is 19440, while the sum is 41.

The square root of 195811961 is about 13993.2827099291. The cubic root of 195811961 is about 580.6927523103.

The spelling of 195811961 in words is "one hundred ninety-five million, eight hundred eleven thousand, nine hundred sixty-one".