1161665 has 4 divisors (see below), whose sum is σ = 1394004. Its totient is φ = 929328.

The previous prime is 1161659. The next prime is 1161683. The reversal of 1161665 is 5661611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 923521 + 238144 = 961^2 + 488^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161665 - 2¹⁴ = 1145281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116162 + ... + 116171.

It is an arithmetic number, because the mean of its divisors is an integer number (348501).

2^1161665 is an apocalyptic number.

It is an amenable number.

1161665 is a deficient number, since it is larger than the sum of its proper divisors (232339).

1161665 is an equidigital number, since it uses as much as digits as its factorization.

1161665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232338.

The product of its digits is 1080, while the sum is 26.

The square root of 1161665 is about 1077.8056411060. The cubic root of 1161665 is about 105.1220048179.

The spelling of 1161665 in words is "one million, one hundred sixty-one thousand, six hundred sixty-five".