1991596032 has 96 divisors (see below), whose sum is σ = 5899748400. Its totient is φ = 663846912.

The previous prime is 1991596021. The next prime is 1991596043. The reversal of 1991596032 is 2306951991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1991596021) and next prime (1991596043).

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 37288 + ... + 73304.

Almost surely, 2^1991596032 is an apocalyptic number.

1991596032 is a gapful number since it is divisible by the number (12) 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 1991596032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2949874200).

1991596032 is an abundant number, since it is smaller than the sum of its proper divisors (3908152368).

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

1991596032 is an equidigital number, since it uses as much as digits as its factorization.

1991596032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36048 (or 36022 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 1991596032 is about 44627.3014196467. The cubic root of 1991596032 is about 1258.1538496320.

The spelling of 1991596032 in words is "one billion, nine hundred ninety-one million, five hundred ninety-six thousand, thirty-two".