191131852035540 has 192 divisors, whose sum is σ = 580185748316160. Its totient is φ = 46733614502400.

The previous prime is 191131852035539. The next prime is 191131852035547. The reversal of 191131852035540 is 45530258131191.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 191131852035540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191131852035547) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2799243121 + ... + 2799311399.

It is an arithmetic number, because the mean of its divisors is an integer number (3021800772480).

Almost surely, 2^{191131852035540} is an apocalyptic number.

191131852035540 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 191131852035540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290092874158080).

191131852035540 is an abundant number, since it is smaller than the sum of its proper divisors (389053896280620).

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

191131852035540 is a wasteful number, since it uses less digits than its factorization.

191131852035540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92222 (or 92220 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 48.

The spelling of 191131852035540 in words is "one hundred ninety-one trillion, one hundred thirty-one billion, eight hundred fifty-two million, thirty-five thousand, five hundred forty".