11965811 has 12 divisors (see below), whose sum is σ = 14166096. Its totient is φ = 10039920.

The previous prime is 11965781. The next prime is 11965817. The reversal of 11965811 is 11856911.

It is not a de Polignac number, because 11965811 - 2⁶ = 11965747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11965817) 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, 2231 + ... + 5376.

It is an arithmetic number, because the mean of its divisors is an integer number (1180508).

Almost surely, 2^11965811 is an apocalyptic number.

11965811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11965811 is a deficient number, since it is larger than the sum of its proper divisors (2200285).

11965811 is a wasteful number, since it uses less digits than its factorization.

11965811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7642 (or 7631 counting only the distinct ones).

The product of its digits is 2160, while the sum is 32.

The square root of 11965811 is about 3459.1633381498. The cubic root of 11965811 is about 228.7252159439.

Subtracting from 11965811 its reverse (11856911), we obtain a square (108900 = 330²).

It can be divided in two parts, 1196 and 5811, that added together give a palindrome (7007).

The spelling of 11965811 in words is "eleven million, nine hundred sixty-five thousand, eight hundred eleven".