191988883 has 4 divisors (see below), whose sum is σ = 192024328. Its totient is φ = 191953440.

The previous prime is 191988833. The next prime is 191988887. The reversal of 191988883 is 388889191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 388889191 = 2011 ⋅193381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191988883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191988887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7713 + ... + 21058.

It is an arithmetic number, because the mean of its divisors is an integer number (48006082).

Almost surely, 2^191988883 is an apocalyptic number.

191988883 is a deficient number, since it is larger than the sum of its proper divisors (35445).

191988883 is an equidigital number, since it uses as much as digits as its factorization.

191988883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35444.

The product of its digits is 995328, while the sum is 55.

The square root of 191988883 is about 13856.0053045602. The cubic root of 191988883 is about 576.8886935411. Note that the first 3 decimals are identical.

The spelling of 191988883 in words is "one hundred ninety-one million, nine hundred eighty-eight thousand, eight hundred eighty-three".