991450 has 24 divisors (see below), whose sum is σ = 1874880. Its totient is φ = 390000.

The previous prime is 991447. The next prime is 991453. The reversal of 991450 is 54199.

991450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (991447) and next prime (991453).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (991453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3825 + ... + 4075.

It is an arithmetic number, because the mean of its divisors is an integer number (78120).

2⁹⁹¹⁴⁵⁰ is an apocalyptic number.

991450 is a deficient number, since it is larger than the sum of its proper divisors (883430).

991450 is a wasteful number, since it uses less digits than its factorization.

991450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 991450 is about 995.7158229133. The cubic root of 991450 is about 99.7141838697.

It can be divided in two parts, 991 and 450, that added together give a palindrome (1441).

The spelling of 991450 in words is "nine hundred ninety-one thousand, four hundred fifty".