191117489983 has 4 divisors (see below), whose sum is σ = 218419988560. Its totient is φ = 163814991408.

The previous prime is 191117489977. The next prime is 191117490023. The reversal of 191117489983 is 389984711191.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191117489983 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 (191117489923) 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, 13651249278 + ... + 13651249291.

It is an arithmetic number, because the mean of its divisors is an integer number (54604997140).

Almost surely, 2^191117489983 is an apocalyptic number.

191117489983 is a deficient number, since it is larger than the sum of its proper divisors (27302498577).

191117489983 is an equidigital number, since it uses as much as digits as its factorization.

191117489983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27302498576.

The product of its digits is 3919104, while the sum is 61.

The spelling of 191117489983 in words is "one hundred ninety-one billion, one hundred seventeen million, four hundred eighty-nine thousand, nine hundred eighty-three".