191211491328 has 832 divisors, whose sum is σ = 655105957632. Its totient is φ = 48695869440.

The previous prime is 191211491321. The next prime is 191211491353. The reversal of 191211491328 is 823194112191.

It is a tau number, because it is divible by the number of its divisors (832).

It is a self number, because there is not a number n which added to its sum of digits gives 191211491328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191211491321) 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 63 ways as a sum of consecutive naturals, for example, 1105268650 + ... + 1105268822.

Almost surely, 2^191211491328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191211491328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327552978816).

191211491328 is an abundant number, since it is smaller than the sum of its proper divisors (463894466304).

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

191211491328 is a wasteful number, since it uses less digits than its factorization.

191211491328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 256 counting only the distinct ones).

The product of its digits is 31104, while the sum is 42.

The spelling of 191211491328 in words is "one hundred ninety-one billion, two hundred eleven million, four hundred ninety-one thousand, three hundred twenty-eight".