991465 has 8 divisors (see below), whose sum is σ = 1215360. Its totient is φ = 776112.

The previous prime is 991453. The next prime is 991483. The reversal of 991465 is 564199.

991465 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 a cyclic number.

It is not a de Polignac number, because 991465 - 2⁹ = 990953 is a prime.

991465 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 991465.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1875 + ... + 2344.

It is an arithmetic number, because the mean of its divisors is an integer number (151920).

2⁹⁹¹⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

991465 is a deficient number, since it is larger than the sum of its proper divisors (223895).

991465 is a wasteful number, since it uses less digits than its factorization.

991465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271.

The product of its digits is 9720, while the sum is 34.

The square root of 991465 is about 995.7233551544. The cubic root of 991465 is about 99.7146867376.

The spelling of 991465 in words is "nine hundred ninety-one thousand, four hundred sixty-five".