991082142 has 80 divisors (see below), whose sum is σ = 2354418000. Its totient is φ = 310728960.

The previous prime is 991082137. The next prime is 991082143. The reversal of 991082142 is 241280199.

It is a junction number, because it is equal to n+sod(n) for n = 991082097 and 991082106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991082143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 457542 + ... + 459702.

It is an arithmetic number, because the mean of its divisors is an integer number (29430225).

Almost surely, 2^991082142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991082142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1177209000).

991082142 is an abundant number, since it is smaller than the sum of its proper divisors (1363335858).

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

991082142 is a wasteful number, since it uses less digits than its factorization.

991082142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343 (or 2334 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 991082142 is about 31481.4571136725. The cubic root of 991082142 is about 997.0185001599.

The spelling of 991082142 in words is "nine hundred ninety-one million, eighty-two thousand, one hundred forty-two".