991475 has 6 divisors (see below), whose sum is σ = 1229460. Its totient is φ = 793160.

The previous prime is 991453. The next prime is 991483. The reversal of 991475 is 574199.

It is not a de Polignac number, because 991475 - 2¹⁸ = 729331 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991475.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19805 + ... + 19854.

It is an arithmetic number, because the mean of its divisors is an integer number (204910).

2⁹⁹¹⁴⁷⁵ is an apocalyptic number.

991475 is a deficient number, since it is larger than the sum of its proper divisors (237985).

991475 is a wasteful number, since it uses less digits than its factorization.

991475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39669 (or 39664 counting only the distinct ones).

The product of its digits is 11340, while the sum is 35.

The square root of 991475 is about 995.7283766168. The cubic root of 991475 is about 99.7150219801.

The spelling of 991475 in words is "nine hundred ninety-one thousand, four hundred seventy-five".