191913 has 16 divisors (see below), whose sum is σ = 279936. Its totient is φ = 116480.

The previous prime is 191911. The next prime is 191929. The reversal of 191913 is 319191.

It is a cyclic number.

It is not a de Polignac number, because 191913 - 2¹ = 191911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2668 + ... + 2738.

It is an arithmetic number, because the mean of its divisors is an integer number (17496).

2¹⁹¹⁹¹³ is an apocalyptic number.

It is an amenable number.

191913 is a deficient number, since it is larger than the sum of its proper divisors (88023).

191913 is a wasteful number, since it uses less digits than its factorization.

191913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144.

The product of its digits is 243, while the sum is 24.

The square root of 191913 is about 438.0787600421. The cubic root of 191913 is about 57.6812679047.

The spelling of 191913 in words is "one hundred ninety-one thousand, nine hundred thirteen".