1991534382 has 12 divisors (see below), whose sum is σ = 4314991200. Its totient is φ = 663844788.

The previous prime is 1991534353. The next prime is 1991534407. The reversal of 1991534382 is 2834351991.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55320382 + ... + 55320417.

It is an arithmetic number, because the mean of its divisors is an integer number (359582600).

Almost surely, 2^1991534382 is an apocalyptic number.

1991534382 is an abundant number, since it is smaller than the sum of its proper divisors (2323456818).

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

1991534382 is a wasteful number, since it uses less digits than its factorization.

1991534382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110640807 (or 110640804 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 1991534382 is about 44626.6106936209. The cubic root of 1991534382 is about 1258.1408674167.

The spelling of 1991534382 in words is "one billion, nine hundred ninety-one million, five hundred thirty-four thousand, three hundred eighty-two".