991347 has 8 divisors (see below), whose sum is σ = 1510656. Its totient is φ = 566472.

The previous prime is 991343. The next prime is 991357. The reversal of 991347 is 743199.

991347 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 991347 - 2² = 991343 is a prime.

991347 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991347.

It is not an unprimeable number, because it can be changed into a prime (991343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23583 + ... + 23624.

It is an arithmetic number, because the mean of its divisors is an integer number (188832).

2⁹⁹¹³⁴⁷ is an apocalyptic number.

991347 is a deficient number, since it is larger than the sum of its proper divisors (519309).

991347 is a wasteful number, since it uses less digits than its factorization.

991347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47217.

The product of its digits is 6804, while the sum is 33.

The square root of 991347 is about 995.6640999855. The cubic root of 991347 is about 99.7107307063.

The spelling of 991347 in words is "nine hundred ninety-one thousand, three hundred forty-seven".