191010000000 has 256 divisors, whose sum is σ = 634310876160. Its totient is φ = 50928000000.

The previous prime is 191009999987. The next prime is 191010000023. The reversal of 191010000000 is 10191.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29996817 + ... + 30003183.

It is an arithmetic number, because the mean of its divisors is an integer number (2477776860).

Almost surely, 2^191010000000 is an apocalyptic number.

191010000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191010000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317155438080).

191010000000 is an abundant number, since it is smaller than the sum of its proper divisors (443300876160).

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

191010000000 is an frugal number, since it uses more digits than its factorization.

191010000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6419 (or 6377 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 12.

Adding to 191010000000 its reverse (10191), we get a palindrome (191010010191).

The spelling of 191010000000 in words is "one hundred ninety-one billion, ten million", and thus it is an aban number.