991469 has 4 divisors (see below), whose sum is σ = 998844. Its totient is φ = 984096.

The previous prime is 991453. The next prime is 991483. The reversal of 991469 is 964199.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 619369 + 372100 = 787^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 991469 - 2⁴ = 991453 is a prime.

It is a super-2 number, since 2×991469² = 1966021555922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991469.

It is not an unprimeable number, because it can be changed into a prime (991409) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3482 + ... + 3755.

It is an arithmetic number, because the mean of its divisors is an integer number (249711).

2⁹⁹¹⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

991469 is a deficient number, since it is larger than the sum of its proper divisors (7375).

991469 is a wasteful number, since it uses less digits than its factorization.

991469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7374.

The product of its digits is 17496, while the sum is 38.

The square root of 991469 is about 995.7253637424. The cubic root of 991469 is about 99.7148208349.

The spelling of 991469 in words is "nine hundred ninety-one thousand, four hundred sixty-nine".