191012985 has 80 divisors (see below), whose sum is σ = 365439360. Its totient is φ = 95178240.

The previous prime is 191012971. The next prime is 191012989. The reversal of 191012985 is 589210191.

It is not a de Polignac number, because 191012985 - 2⁸ = 191012729 is a prime.

It is a super-2 number, since 2×191012985² = 72971920877220450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191012989) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 792465 + ... + 792705.

It is an arithmetic number, because the mean of its divisors is an integer number (4567992).

Almost surely, 2^191012985 is an apocalyptic number.

191012985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191012985 is a deficient number, since it is larger than the sum of its proper divisors (174426375).

191012985 is a wasteful number, since it uses less digits than its factorization.

191012985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 191012985 is about 13820.7447339136. The cubic root of 191012985 is about 575.9095723928.

The spelling of 191012985 in words is "one hundred ninety-one million, twelve thousand, nine hundred eighty-five".