191271020 has 24 divisors (see below), whose sum is σ = 405358800. Its totient is φ = 75805632.

The previous prime is 191271007. The next prime is 191271071. The reversal of 191271020 is 20172191.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41690 + ... + 46049.

It is an arithmetic number, because the mean of its divisors is an integer number (16889950).

Almost surely, 2^191271020 is an apocalyptic number.

191271020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191271020 is an abundant number, since it is smaller than the sum of its proper divisors (214087780).

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

191271020 is a wasteful number, since it uses less digits than its factorization.

191271020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87857 (or 87855 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 191271020 is about 13830.0766447623. The cubic root of 191271020 is about 576.1687833239.

The spelling of 191271020 in words is "one hundred ninety-one million, two hundred seventy-one thousand, twenty".