991192752 has 120 divisors (see below), whose sum is σ = 3204236880. Its totient is φ = 282685440.

The previous prime is 991192693. The next prime is 991192777. The reversal of 991192752 is 257291199.

It is a junction number, because it is equal to n+sod(n) for n = 991192698 and 991192707.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8524 + ... + 45332.

It is an arithmetic number, because the mean of its divisors is an integer number (26701974).

Almost surely, 2^991192752 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 991192752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1602118440).

991192752 is an abundant number, since it is smaller than the sum of its proper divisors (2213044128).

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

991192752 is a wasteful number, since it uses less digits than its factorization.

991192752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36851 (or 36842 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 991192752 is about 31483.2138130782. The cubic root of 991192752 is about 997.0555896231.

The spelling of 991192752 in words is "nine hundred ninety-one million, one hundred ninety-two thousand, seven hundred fifty-two".