11671865 has 4 divisors (see below), whose sum is σ = 14006244. Its totient is φ = 9337488.

The previous prime is 11671861. The next prime is 11671889. The reversal of 11671865 is 56817611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56817611 = 1061 ⋅53551.

It can be written as a sum of positive squares in 2 ways, for example, as 4376464 + 7295401 = 2092^2 + 2701^2 .

It is a cyclic number.

It is not a de Polignac number, because 11671865 - 2² = 11671861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11671861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1167182 + ... + 1167191.

It is an arithmetic number, because the mean of its divisors is an integer number (3501561).

Almost surely, 2^11671865 is an apocalyptic number.

It is an amenable number.

11671865 is a deficient number, since it is larger than the sum of its proper divisors (2334379).

11671865 is an equidigital number, since it uses as much as digits as its factorization.

11671865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334378.

The product of its digits is 10080, while the sum is 35.

The square root of 11671865 is about 3416.4111286553. The cubic root of 11671865 is about 226.8367511859.

The spelling of 11671865 in words is "eleven million, six hundred seventy-one thousand, eight hundred sixty-five".