191740943 has 4 divisors (see below), whose sum is σ = 203019840. Its totient is φ = 180462048.

The previous prime is 191740931. The next prime is 191740963. The reversal of 191740943 is 349047191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 349047191 = 4153 ⋅84047.

It is a cyclic number.

It is not a de Polignac number, because 191740943 - 2²⁰ = 190692367 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191740897 and 191740906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191740963) 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, 5639423 + ... + 5639456.

It is an arithmetic number, because the mean of its divisors is an integer number (50754960).

Almost surely, 2^191740943 is an apocalyptic number.

191740943 is a deficient number, since it is larger than the sum of its proper divisors (11278897).

191740943 is a wasteful number, since it uses less digits than its factorization.

191740943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11278896.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 191740943 is about 13847.0553909486. The cubic root of 191740943 is about 576.6402496428.

The spelling of 191740943 in words is "one hundred ninety-one million, seven hundred forty thousand, nine hundred forty-three".