1991532 has 12 divisors (see below), whose sum is σ = 4646936. Its totient is φ = 663840.

The previous prime is 1991527. The next prime is 1991551. The reversal of 1991532 is 2351991.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1991532.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82969 + ... + 82992.

2^1991532 is an apocalyptic number.

1991532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1991532 is an abundant number, since it is smaller than the sum of its proper divisors (2655404).

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

1991532 is a wasteful number, since it uses less digits than its factorization.

1991532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165968 (or 165966 counting only the distinct ones).

The product of its digits is 2430, while the sum is 30.

The square root of 1991532 is about 1411.2164965022. The cubic root of 1991532 is about 125.8140365811.

The spelling of 1991532 in words is "one million, nine hundred ninety-one thousand, five hundred thirty-two".