11131865 has 4 divisors (see below), whose sum is σ = 13358244. Its totient is φ = 8905488.

The previous prime is 11131859. The next prime is 11131873. The reversal of 11131865 is 56813111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56813111 = 31 ⋅1832681.

It can be written as a sum of positive squares in 2 ways, for example, as 7333264 + 3798601 = 2708^2 + 1949^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131865 - 2⁶ = 11131801 is a prime.

It is a Duffinian 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, 1113182 + ... + 1113191.

It is an arithmetic number, because the mean of its divisors is an integer number (3339561).

Almost surely, 2^11131865 is an apocalyptic number.

It is an amenable number.

11131865 is a deficient number, since it is larger than the sum of its proper divisors (2226379).

11131865 is an equidigital number, since it uses as much as digits as its factorization.

11131865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2226378.

The product of its digits is 720, while the sum is 26.

The square root of 11131865 is about 3336.4449643295. Note that the first 3 decimals coincide. The cubic root of 11131865 is about 223.2831636521.

Adding to 11131865 its reverse (56813111), we get a palindrome (67944976).

The spelling of 11131865 in words is "eleven million, one hundred thirty-one thousand, eight hundred sixty-five".