991615352 has 96 divisors (see below), whose sum is σ = 2404725120. Its totient is φ = 379572480.

The previous prime is 991615349. The next prime is 991615367. The reversal of 991615352 is 253516199.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 154838 + ... + 161114.

It is an arithmetic number, because the mean of its divisors is an integer number (25049220).

Almost surely, 2^991615352 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 991615352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1202362560).

991615352 is an abundant number, since it is smaller than the sum of its proper divisors (1413109768).

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

991615352 is a wasteful number, since it uses less digits than its factorization.

991615352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6341 (or 6330 counting only the distinct ones).

The product of its digits is 72900, while the sum is 41.

The square root of 991615352 is about 31489.9246108974. The cubic root of 991615352 is about 997.1972693731.

The spelling of 991615352 in words is "nine hundred ninety-one million, six hundred fifteen thousand, three hundred fifty-two".