991056 has 40 divisors (see below), whose sum is σ = 2794464. Its totient is φ = 300160.

The previous prime is 991043. The next prime is 991057. The reversal of 991056 is 650199.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991057) by changing a digit.

991056 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411 + ... + 1466.

2⁹⁹¹⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

991056 is an abundant number, since it is smaller than the sum of its proper divisors (1803408).

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

991056 is a wasteful number, since it uses less digits than its factorization.

991056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899 (or 1893 counting only the distinct ones).

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

The square root of 991056 is about 995.5179556392. The cubic root of 991056 is about 99.7009733888.

The spelling of 991056 in words is "nine hundred ninety-one thousand, fifty-six".