991039050 has 240 divisors, whose sum is σ = 2965390560. Its totient is φ = 245643840.

The previous prime is 991039037. The next prime is 991039051. The reversal of 991039050 is 50930199.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 991038996 and 991039014.

It is not an unprimeable number, because it can be changed into a prime (991039051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 18698824 + ... + 18698876.

It is an arithmetic number, because the mean of its divisors is an integer number (12355794).

Almost surely, 2^991039050 is an apocalyptic number.

991039050 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 991039050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1482695280).

991039050 is an abundant number, since it is smaller than the sum of its proper divisors (1974351510).

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

991039050 is an equidigital number, since it uses as much as digits as its factorization.

991039050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 991039050 is about 31480.7727033502. The cubic root of 991039050 is about 997.0040499133.

The spelling of 991039050 in words is "nine hundred ninety-one million, thirty-nine thousand, fifty".