11517965 has 4 divisors (see below), whose sum is σ = 13821564. Its totient is φ = 9214368.

The previous prime is 11517953. The next prime is 11517973. The reversal of 11517965 is 56971511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56971511 = 199 ⋅286289.

It can be written as a sum of positive squares in 2 ways, for example, as 8916196 + 2601769 = 2986^2 + 1613^2 .

It is a cyclic number.

It is not a de Polignac number, because 11517965 - 2⁴ = 11517949 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 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, 1151792 + ... + 1151801.

It is an arithmetic number, because the mean of its divisors is an integer number (3455391).

Almost surely, 2^11517965 is an apocalyptic number.

It is an amenable number.

11517965 is a deficient number, since it is larger than the sum of its proper divisors (2303599).

11517965 is an equidigital number, since it uses as much as digits as its factorization.

11517965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303598.

The product of its digits is 9450, while the sum is 35.

The square root of 11517965 is about 3393.8127526427. The cubic root of 11517965 is about 225.8353474794.

The spelling of 11517965 in words is "eleven million, five hundred seventeen thousand, nine hundred sixty-five".