11500865 has 4 divisors (see below), whose sum is σ = 13801044. Its totient is φ = 9200688.

The previous prime is 11500861. The next prime is 11500873. The reversal of 11500865 is 56800511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7612081 + 3888784 = 2759^2 + 1972^2 .

It is a cyclic number.

It is not a de Polignac number, because 11500865 - 2² = 11500861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11500861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150082 + ... + 1150091.

It is an arithmetic number, because the mean of its divisors is an integer number (3450261).

Almost surely, 2^11500865 is an apocalyptic number.

It is an amenable number.

11500865 is a deficient number, since it is larger than the sum of its proper divisors (2300179).

11500865 is an equidigital number, since it uses as much as digits as its factorization.

11500865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300178.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 11500865 is about 3391.2925264565. The cubic root of 11500865 is about 225.7235309350.

The spelling of 11500865 in words is "eleven million, five hundred thousand, eight hundred sixty-five".