991345248 has 36 divisors (see below), whose sum is σ = 2819138868. Its totient is φ = 330448320.

The previous prime is 991345237. The next prime is 991345253. The reversal of 991345248 is 842543199.

991345248 is a `hidden beast` number, since 9 + 91 + 34 + 524 + 8 = 666.

991345248 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1720798 + ... + 1721373.

It is an arithmetic number, because the mean of its divisors is an integer number (78309413).

Almost surely, 2^991345248 is an apocalyptic number.

It is an amenable number.

991345248 is an abundant number, since it is smaller than the sum of its proper divisors (1827793620).

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

991345248 is a wasteful number, since it uses less digits than its factorization.

991345248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3442187 (or 3442176 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 991345248 is about 31485.6355819602. The cubic root of 991345248 is about 997.1067196689.

The spelling of 991345248 in words is "nine hundred ninety-one million, three hundred forty-five thousand, two hundred forty-eight".