191231994773 has 8 divisors (see below), whose sum is σ = 202716668160. Its totient is φ = 179773513920.

The previous prime is 191231994761. The next prime is 191231994781. The reversal of 191231994773 is 377499132191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191231994773 - 2⁴ = 191231994757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191231994073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6533093 + ... + 6562298.

It is an arithmetic number, because the mean of its divisors is an integer number (25339583520).

Almost surely, 2^191231994773 is an apocalyptic number.

It is an amenable number.

191231994773 is a deficient number, since it is larger than the sum of its proper divisors (11484673387).

191231994773 is a wasteful number, since it uses less digits than its factorization.

191231994773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13096267.

The product of its digits is 2571912, while the sum is 56.

The spelling of 191231994773 in words is "one hundred ninety-one billion, two hundred thirty-one million, nine hundred ninety-four thousand, seven hundred seventy-three".