991446912 has 128 divisors (see below), whose sum is σ = 2997943200. Its totient is φ = 322375680.

The previous prime is 991446893. The next prime is 991446949. The reversal of 991446912 is 219644199.

It is a tau number, because it is divible by the number of its divisors (128).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138198 + ... + 145194.

Almost surely, 2^991446912 is an apocalyptic number.

991446912 is the 15744-th decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991446912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1498971600).

991446912 is an abundant number, since it is smaller than the sum of its proper divisors (2006496288).

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

991446912 is a wasteful number, since it uses less digits than its factorization.

991446912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7061 (or 7043 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 991446912 is about 31487.2499910678. The cubic root of 991446912 is about 997.1408034531.

The spelling of 991446912 in words is "nine hundred ninety-one million, four hundred forty-six thousand, nine hundred twelve".