191100012 has 24 divisors (see below), whose sum is σ = 446443200. Its totient is φ = 63622416.

The previous prime is 191100001. The next prime is 191100023. The reversal of 191100012 is 210001191.

It is an interprime number because it is at equal distance from previous prime (191100001) and next prime (191100023).

It is a junction number, because it is equal to n+sod(n) for n = 191099964 and 191100000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1039 + ... + 19577.

It is an arithmetic number, because the mean of its divisors is an integer number (18601800).

Almost surely, 2^191100012 is an apocalyptic number.

191100012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

191100012 is an abundant number, since it is smaller than the sum of its proper divisors (255343188).

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

191100012 is a wasteful number, since it uses less digits than its factorization.

191100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19405 (or 19403 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 15.

The square root of 191100012 is about 13823.8927947232. The cubic root of 191100012 is about 575.9970220718.

The spelling of 191100012 in words is "one hundred ninety-one million, one hundred thousand, twelve".