191019040128 has 128 divisors (see below), whose sum is σ = 644310336000. Its totient is φ = 54576861696.

The previous prime is 191019040063. The next prime is 191019040181. The reversal of 191019040128 is 821040910191.

191019040128 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 191019040092 and 191019040101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3923788 + ... + 3972171.

It is an arithmetic number, because the mean of its divisors is an integer number (5033674500).

Almost surely, 2^191019040128 is an apocalyptic number.

191019040128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

191019040128 is an abundant number, since it is smaller than the sum of its proper divisors (453291295872).

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

191019040128 is an equidigital number, since it uses as much as digits as its factorization.

191019040128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7895989 (or 7895971 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The spelling of 191019040128 in words is "one hundred ninety-one billion, nineteen million, forty thousand, one hundred twenty-eight".