191081930 has 32 divisors (see below), whose sum is σ = 386515584. Its totient is φ = 67484736.

The previous prime is 191081927. The next prime is 191081959. The reversal of 191081930 is 39180191.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28964 + ... + 34943.

It is an arithmetic number, because the mean of its divisors is an integer number (12078612).

Almost surely, 2^191081930 is an apocalyptic number.

191081930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191081930 is an abundant number, since it is smaller than the sum of its proper divisors (195433654).

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

191081930 is a wasteful number, since it uses less digits than its factorization.

191081930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63950.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 191081930 is about 13823.2387666567. The cubic root of 191081930 is about 575.9788544353.

The spelling of 191081930 in words is "one hundred ninety-one million, eighty-one thousand, nine hundred thirty".