991100032 has 32 divisors (see below), whose sum is σ = 2126341980. Its totient is φ = 457430016.

The previous prime is 991099973. The next prime is 991100081. The reversal of 991100032 is 230001199.

It can be written as a sum of positive squares in 2 ways, for example, as 960008256 + 31091776 = 30984^2 + 5576^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 296143 + ... + 299470.

Almost surely, 2^991100032 is an apocalyptic number.

It is an amenable number.

991100032 is an abundant number, since it is smaller than the sum of its proper divisors (1135241948).

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

991100032 is a wasteful number, since it uses less digits than its factorization.

991100032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595640 (or 595628 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 991100032 is about 31481.7412479043. The cubic root of 991100032 is about 997.0244991762.

The spelling of 991100032 in words is "nine hundred ninety-one million, one hundred thousand, thirty-two".