191136913 has 8 divisors (see below), whose sum is σ = 209563200. Its totient is φ = 172885680.

The previous prime is 191136871. The next prime is 191136919. The reversal of 191136913 is 319631191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 191136913 - 2⁹ = 191136401 is a prime.

It is a super-2 number, since 2×191136913² = 73066639022339138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191136919) 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 7 ways as a sum of consecutive naturals, for example, 41470 + ... + 45847.

It is an arithmetic number, because the mean of its divisors is an integer number (26195400).

Almost surely, 2^191136913 is an apocalyptic number.

It is an amenable number.

191136913 is a deficient number, since it is larger than the sum of its proper divisors (18426287).

191136913 is a wasteful number, since it uses less digits than its factorization.

191136913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87527.

The product of its digits is 4374, while the sum is 34.

The square root of 191136913 is about 13825.2274122345. The cubic root of 191136913 is about 576.0340942798.

The spelling of 191136913 in words is "one hundred ninety-one million, one hundred thirty-six thousand, nine hundred thirteen".