191020012 has 12 divisors (see below), whose sum is σ = 334428640. Its totient is φ = 95468976.

The previous prime is 191020009. The next prime is 191020073. The reversal of 191020012 is 210020191.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1789 + ... + 19627.

Almost surely, 2^191020012 is an apocalyptic number.

It is an amenable number.

191020012 is a deficient number, since it is larger than the sum of its proper divisors (143408628).

191020012 is a wasteful number, since it uses less digits than its factorization.

191020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20520 (or 20518 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 191020012 is about 13820.9989508718. The cubic root of 191020012 is about 575.9166345077.

The spelling of 191020012 in words is "one hundred ninety-one million, twenty thousand, twelve".