191012871 has 16 divisors (see below), whose sum is σ = 306387200. Its totient is φ = 103405248.

The previous prime is 191012849. The next prime is 191012893. The reversal of 191012871 is 178210191.

It is an interprime number because it is at equal distance from previous prime (191012849) and next prime (191012893).

It is not a de Polignac number, because 191012871 - 2⁵ = 191012839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191012671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238966 + ... + 239763.

It is an arithmetic number, because the mean of its divisors is an integer number (19149200).

Almost surely, 2^191012871 is an apocalyptic number.

191012871 is a deficient number, since it is larger than the sum of its proper divisors (115374329).

191012871 is a wasteful number, since it uses less digits than its factorization.

191012871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478758.

The product of its (nonzero) digits is 1008, while the sum is 30.

The square root of 191012871 is about 13820.7406096779. The cubic root of 191012871 is about 575.9094578217.

The spelling of 191012871 in words is "one hundred ninety-one million, twelve thousand, eight hundred seventy-one".