191038113 has 18 divisors (see below), whose sum is σ = 320996754. Its totient is φ = 109164384.

The previous prime is 191038093. The next prime is 191038157. The reversal of 191038113 is 311830191.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 173923344 + 17114769 = 13188^2 + 4137^2 .

It is not a de Polignac number, because 191038113 - 2⁹ = 191037601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191038193) 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 17 ways as a sum of consecutive naturals, for example, 216156 + ... + 217037.

It is an arithmetic number, because the mean of its divisors is an integer number (17833153).

Almost surely, 2^191038113 is an apocalyptic number.

It is an amenable number.

191038113 is a deficient number, since it is larger than the sum of its proper divisors (129958641).

191038113 is a wasteful number, since it uses less digits than its factorization.

191038113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433213 (or 433203 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 191038113 is about 13821.6537722517. The cubic root of 191038113 is about 575.9348251633.

The spelling of 191038113 in words is "one hundred ninety-one million, thirty-eight thousand, one hundred thirteen".