991109248 has 32 divisors (see below), whose sum is σ = 2090625660. Its totient is φ = 466403328.

The previous prime is 991109243. The next prime is 991109267. The reversal of 991109248 is 842901199.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 929518144 + 61591104 = 30488^2 + 7848^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×991109248² = 1964595082942251008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (991109243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225561 + ... + 229912.

Almost surely, 2^991109248 is an apocalyptic number.

It is an amenable number.

991109248 is an abundant number, since it is smaller than the sum of its proper divisors (1099516412).

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

991109248 is a wasteful number, since it uses less digits than its factorization.

991109248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455504 (or 455492 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 991109248 is about 31481.8876181210. The cubic root of 991109248 is about 997.0275895300.

The spelling of 991109248 in words is "nine hundred ninety-one million, one hundred nine thousand, two hundred forty-eight".