991122616 has 48 divisors (see below), whose sum is σ = 2046822120. Its totient is φ = 449592000.

The previous prime is 991122581. The next prime is 991122637. The reversal of 991122616 is 616221199.

991122616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 761166 + ... + 762466.

Almost surely, 2^991122616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991122616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1023411060).

991122616 is an abundant number, since it is smaller than the sum of its proper divisors (1055699504).

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

991122616 is a wasteful number, since it uses less digits than its factorization.

991122616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116 (or 2101 counting only the distinct ones).

The product of its digits is 11664, while the sum is 37.

The square root of 991122616 is about 31482.0999299602. The cubic root of 991122616 is about 997.0320721185.

The spelling of 991122616 in words is "nine hundred ninety-one million, one hundred twenty-two thousand, six hundred sixteen".