809149 has 8 divisors (see below), whose sum is σ = 934848. Its totient is φ = 692160.

The previous prime is 809147. The next prime is 809173. The reversal of 809149 is 941908.

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 809149 - 2¹ = 809147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 809149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809141) 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 7 ways as a sum of consecutive naturals, for example, 1977 + ... + 2350.

It is an arithmetic number, because the mean of its divisors is an integer number (116856).

2⁸⁰⁹¹⁴⁹ is an apocalyptic number.

It is an amenable number.

809149 is a deficient number, since it is larger than the sum of its proper divisors (125699).

809149 is a wasteful number, since it uses less digits than its factorization.

809149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4355.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 809149 is about 899.5270979798. The cubic root of 809149 is about 93.1843186177.

It can be divided in two parts, 80 and 9149, that added together give a palindrome (9229).

The spelling of 809149 in words is "eight hundred nine thousand, one hundred forty-nine".