196961975391 has 4 divisors (see below), whose sum is σ = 262615967192. Its totient is φ = 131307983592.

The previous prime is 196961975387. The next prime is 196961975417. The reversal of 196961975391 is 193579169691.

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

It is not a de Polignac number, because 196961975391 - 2² = 196961975387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196961975321) 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, 32826995896 + ... + 32826995901.

It is an arithmetic number, because the mean of its divisors is an integer number (65653991798).

Almost surely, 2^196961975391 is an apocalyptic number.

196961975391 is a deficient number, since it is larger than the sum of its proper divisors (65653991801).

196961975391 is an equidigital number, since it uses as much as digits as its factorization.

196961975391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65653991800.

The product of its digits is 24800580, while the sum is 66.

The spelling of 196961975391 in words is "one hundred ninety-six billion, nine hundred sixty-one million, nine hundred seventy-five thousand, three hundred ninety-one".