1181609 has 8 divisors (see below), whose sum is σ = 1388352. Its totient is φ = 991440.

The previous prime is 1181581. The next prime is 1181611. The reversal of 1181609 is 9061811.

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 1181609 - 2¹² = 1177513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1181699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3989 + ... + 4274.

It is an arithmetic number, because the mean of its divisors is an integer number (173544).

2^1181609 is an apocalyptic number.

It is an amenable number.

1181609 is a deficient number, since it is larger than the sum of its proper divisors (206743).

1181609 is a wasteful number, since it uses less digits than its factorization.

1181609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8287.

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

The square root of 1181609 is about 1087.0183991083. The cubic root of 1181609 is about 105.7201888074.

The spelling of 1181609 in words is "one million, one hundred eighty-one thousand, six hundred nine".