191109130 has 16 divisors (see below), whose sum is σ = 355858920. Its totient is φ = 73807552.

The previous prime is 191109119. The next prime is 191109131. The reversal of 191109130 is 31901191.

It can be written as a sum of positive squares in 4 ways, for example, as 177662241 + 13446889 = 13329^2 + 3667^2 .

It is a junction number, because it is equal to n+sod(n) for n = 191109095 and 191109104.

It is not an unprimeable number, because it can be changed into a prime (191109131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329209 + ... + 329788.

Almost surely, 2^191109130 is an apocalyptic number.

191109130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191109130 is a deficient number, since it is larger than the sum of its proper divisors (164749790).

191109130 is a wasteful number, since it uses less digits than its factorization.

191109130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659033.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 191109130 is about 13824.2225821201. Note that the first 3 decimals coincide. The cubic root of 191109130 is about 576.0061828201.

The spelling of 191109130 in words is "one hundred ninety-one million, one hundred nine thousand, one hundred thirty".