11553865 has 4 divisors (see below), whose sum is σ = 13864644. Its totient is φ = 9243088.

The previous prime is 11553859. The next prime is 11553887. The reversal of 11553865 is 56835511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56835511 = 107 ⋅531173.

It can be written as a sum of positive squares in 2 ways, for example, as 1937664 + 9616201 = 1392^2 + 3101^2 .

It is a cyclic number.

It is not a de Polignac number, because 11553865 - 2⁵ = 11553833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11553865.

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, 1155382 + ... + 1155391.

It is an arithmetic number, because the mean of its divisors is an integer number (3466161).

Almost surely, 2^11553865 is an apocalyptic number.

It is an amenable number.

11553865 is a deficient number, since it is larger than the sum of its proper divisors (2310779).

11553865 is an equidigital number, since it uses as much as digits as its factorization.

11553865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310778.

The product of its digits is 18000, while the sum is 34.

The square root of 11553865 is about 3399.0976743836. The cubic root of 11553865 is about 226.0697372696.

The spelling of 11553865 in words is "eleven million, five hundred fifty-three thousand, eight hundred sixty-five".