191889041 has 4 divisors (see below), whose sum is σ = 194517732. Its totient is φ = 189260352.

The previous prime is 191889031. The next prime is 191889043. The reversal of 191889041 is 140988191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 140988191 = 17 ⋅8293423.

It can be written as a sum of positive squares in 2 ways, for example, as 157126225 + 34762816 = 12535^2 + 5896^2 .

It is a cyclic number.

It is not a de Polignac number, because 191889041 - 2¹⁰ = 191888017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191889041.

It is not an unprimeable number, because it can be changed into a prime (191889043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1314236 + ... + 1314381.

It is an arithmetic number, because the mean of its divisors is an integer number (48629433).

Almost surely, 2^191889041 is an apocalyptic number.

It is an amenable number.

191889041 is a deficient number, since it is larger than the sum of its proper divisors (2628691).

191889041 is an equidigital number, since it uses as much as digits as its factorization.

191889041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628690.

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 191889041 is about 13852.4019938782. The cubic root of 191889041 is about 576.7886743675.

The spelling of 191889041 in words is "one hundred ninety-one million, eight hundred eighty-nine thousand, forty-one".