1161809 has 4 divisors (see below), whose sum is σ = 1267440. Its totient is φ = 1056180.

The previous prime is 1161791. The next prime is 1161829. The reversal of 1161809 is 9081611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1161809 - 2⁸ = 1161553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161829) 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, 52799 + ... + 52820.

It is an arithmetic number, because the mean of its divisors is an integer number (316860).

2^1161809 is an apocalyptic number.

It is an amenable number.

1161809 is a deficient number, since it is larger than the sum of its proper divisors (105631).

1161809 is a wasteful number, since it uses less digits than its factorization.

1161809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105630.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1161809 is about 1077.8724414327. The cubic root of 1161809 is about 105.1263482799.

The spelling of 1161809 in words is "one million, one hundred sixty-one thousand, eight hundred nine".