191109042 has 24 divisors (see below), whose sum is σ = 414329916. Its totient is φ = 63662976.

The previous prime is 191109041. The next prime is 191109091. The reversal of 191109042 is 240901191.

191109042 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 172108161 + 19000881 = 13119^2 + 4359^2 .

It is a junction number, because it is equal to n+sod(n) for n = 191108997 and 191109015.

It is not an unprimeable number, because it can be changed into a prime (191109041) 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, 45078 + ... + 49134.

Almost surely, 2^191109042 is an apocalyptic number.

191109042 is an abundant number, since it is smaller than the sum of its proper divisors (223220874).

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

191109042 is a wasteful number, since it uses less digits than its factorization.

191109042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6682 (or 6679 counting only the distinct ones).

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

The square root of 191109042 is about 13824.2193993006. The cubic root of 191109042 is about 576.0060944089.

The spelling of 191109042 in words is "one hundred ninety-one million, one hundred nine thousand, forty-two".