191191842 has 24 divisors (see below), whose sum is σ = 414713520. Its totient is φ = 63659160.

The previous prime is 191191841. The next prime is 191191879. The reversal of 191191842 is 248191191.

191191842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 191191797 and 191191806.

It is not an unprimeable number, because it can be changed into a prime (191191841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12009 + ... + 22947.

It is an arithmetic number, because the mean of its divisors is an integer number (17279730).

Almost surely, 2^191191842 is an apocalyptic number.

191191842 is an abundant number, since it is smaller than the sum of its proper divisors (223521678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191191842 is a wasteful number, since it uses less digits than its factorization.

191191842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11918 (or 11915 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 191191842 is about 13827.2138191322. The cubic root of 191191842 is about 576.0892692950.

The spelling of 191191842 in words is "one hundred ninety-one million, one hundred ninety-one thousand, eight hundred forty-two".