991250 has 40 divisors (see below), whose sum is σ = 2033724. Its totient is φ = 360000.

The previous prime is 991229. The next prime is 991261. The reversal of 991250 is 52199.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 491401 + 499849 = 701^2 + 707^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991250.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16220 + ... + 16280.

2⁹⁹¹²⁵⁰ is an apocalyptic number.

991250 is an abundant number, since it is smaller than the sum of its proper divisors (1042474).

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

991250 is a wasteful number, since it uses less digits than its factorization.

991250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 991250 is about 995.6153875870. The cubic root of 991250 is about 99.7074784793.

The spelling of 991250 in words is "nine hundred ninety-one thousand, two hundred fifty".