1149809 has 4 divisors (see below), whose sum is σ = 1155060. Its totient is φ = 1144560.

The previous prime is 1149803. The next prime is 1149817. The reversal of 1149809 is 9089411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9089411 = 661 ⋅13751.

It can be written as a sum of positive squares in 2 ways, for example, as 1056784 + 93025 = 1028^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1149809 - 2¹² = 1145713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1149803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2282 + ... + 2739.

It is an arithmetic number, because the mean of its divisors is an integer number (288765).

2^1149809 is an apocalyptic number.

It is an amenable number.

1149809 is a deficient number, since it is larger than the sum of its proper divisors (5251).

1149809 is an equidigital number, since it uses as much as digits as its factorization.

1149809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1149809 is about 1072.2914715692. The cubic root of 1149809 is about 104.7631547437.

The spelling of 1149809 in words is "one million, one hundred forty-nine thousand, eight hundred nine".