1161909 has 12 divisors (see below), whose sum is σ = 1918176. Its totient is φ = 663912.

The previous prime is 1161893. The next prime is 1161929. The reversal of 1161909 is 9091611.

It is not a de Polignac number, because 1161909 - 2⁴ = 1161893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161929) 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, 9159 + ... + 9284.

It is an arithmetic number, because the mean of its divisors is an integer number (159848).

2^1161909 is an apocalyptic number.

It is an amenable number.

1161909 is a deficient number, since it is larger than the sum of its proper divisors (756267).

1161909 is a wasteful number, since it uses less digits than its factorization.

1161909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18456 (or 18453 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 1161909 is about 1077.9188281128. The cubic root of 1161909 is about 105.1293643618.

It can be divided in two parts, 116 and 1909, that added together give a square (2025 = 45²).

The spelling of 1161909 in words is "one million, one hundred sixty-one thousand, nine hundred nine".