11810965 has 4 divisors (see below), whose sum is σ = 14173164. Its totient is φ = 9448768.

The previous prime is 11810963. The next prime is 11810987. The reversal of 11810965 is 56901811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56901811 = 6131 ⋅9281.

It can be written as a sum of positive squares in 2 ways, for example, as 4915089 + 6895876 = 2217^2 + 2626^2 .

It is a cyclic number.

It is not a de Polignac number, because 11810965 - 2¹ = 11810963 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11810963) 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, 1181092 + ... + 1181101.

It is an arithmetic number, because the mean of its divisors is an integer number (3543291).

Almost surely, 2^11810965 is an apocalyptic number.

It is an amenable number.

11810965 is a deficient number, since it is larger than the sum of its proper divisors (2362199).

11810965 is an equidigital number, since it uses as much as digits as its factorization.

11810965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362198.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 11810965 is about 3436.7084543208. The cubic root of 11810965 is about 227.7343075658.

The spelling of 11810965 in words is "eleven million, eight hundred ten thousand, nine hundred sixty-five".