11865515 has 4 divisors (see below), whose sum is σ = 14238624. Its totient is φ = 9492408.

The previous prime is 11865509. The next prime is 11865521. The reversal of 11865515 is 51556811.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (11865509) and next prime (11865521).

It is a cyclic number.

It is not a de Polignac number, because 11865515 - 2¹⁰ = 11864491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186547 + ... + 1186556.

It is an arithmetic number, because the mean of its divisors is an integer number (3559656).

Almost surely, 2^11865515 is an apocalyptic number.

11865515 is a deficient number, since it is larger than the sum of its proper divisors (2373109).

11865515 is an equidigital number, since it uses as much as digits as its factorization.

11865515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373108.

The product of its digits is 6000, while the sum is 32.

The square root of 11865515 is about 3444.6356846552. The cubic root of 11865515 is about 228.0843729490.

The spelling of 11865515 in words is "eleven million, eight hundred sixty-five thousand, five hundred fifteen".