191668443 has 16 divisors (see below), whose sum is σ = 264499200. Its totient is φ = 123330240.

The previous prime is 191668439. The next prime is 191668459. The reversal of 191668443 is 344866191.

It is not a de Polignac number, because 191668443 - 2² = 191668439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191668395 and 191668404.

It is not an unprimeable number, because it can be changed into a prime (191668423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35518 + ... + 40556.

It is an arithmetic number, because the mean of its divisors is an integer number (16531200).

Almost surely, 2^191668443 is an apocalyptic number.

191668443 is a deficient number, since it is larger than the sum of its proper divisors (72830757).

191668443 is a wasteful number, since it uses less digits than its factorization.

191668443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5482.

The product of its digits is 124416, while the sum is 42.

The square root of 191668443 is about 13844.4372583359. The cubic root of 191668443 is about 576.5675618316.

The spelling of 191668443 in words is "one hundred ninety-one million, six hundred sixty-eight thousand, four hundred forty-three".