191976190117 has 4 divisors (see below), whose sum is σ = 193198968556. Its totient is φ = 190753411680.

The previous prime is 191976190111. The next prime is 191976190163. The reversal of 191976190117 is 711091679191.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44524798081 + 147451392036 = 211009^2 + 383994^2 .

It is a cyclic number.

It is not a de Polignac number, because 191976190117 - 2¹⁵ = 191976157349 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 (191976190111) 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 3 ways as a sum of consecutive naturals, for example, 611388984 + ... + 611389297.

It is an arithmetic number, because the mean of its divisors is an integer number (48299742139).

Almost surely, 2^191976190117 is an apocalyptic number.

It is an amenable number.

191976190117 is a deficient number, since it is larger than the sum of its proper divisors (1222778439).

191976190117 is a wasteful number, since it uses less digits than its factorization.

191976190117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222778438.

The product of its (nonzero) digits is 214326, while the sum is 52.

The spelling of 191976190117 in words is "one hundred ninety-one billion, nine hundred seventy-six million, one hundred ninety thousand, one hundred seventeen".