191091134 has 16 divisors (see below), whose sum is σ = 309180480. Its totient is φ = 88054560.

The previous prime is 191091073. The next prime is 191091139. The reversal of 191091134 is 431190191.

It is a junction number, because it is equal to n+sod(n) for n = 191091097 and 191091106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191091139) 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 7 ways as a sum of consecutive naturals, for example, 11627 + ... + 22745.

It is an arithmetic number, because the mean of its divisors is an integer number (19323780).

Almost surely, 2^191091134 is an apocalyptic number.

191091134 is a deficient number, since it is larger than the sum of its proper divisors (118089346).

191091134 is a wasteful number, since it uses less digits than its factorization.

191091134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11795.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 191091134 is about 13823.5716802858. The cubic root of 191091134 is about 575.9881021687.

The spelling of 191091134 in words is "one hundred ninety-one million, ninety-one thousand, one hundred thirty-four".