11721265 has 4 divisors (see below), whose sum is σ = 14065524. Its totient is φ = 9377008.

The previous prime is 11721263. The next prime is 11721287. The reversal of 11721265 is 56212711.

11721265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56212711 = 1601 ⋅35111.

It can be written as a sum of positive squares in 2 ways, for example, as 1760929 + 9960336 = 1327^2 + 3156^2 .

It is a cyclic number.

It is not a de Polignac number, because 11721265 - 2¹ = 11721263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11721263) 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, 1172122 + ... + 1172131.

It is an arithmetic number, because the mean of its divisors is an integer number (3516381).

Almost surely, 2^11721265 is an apocalyptic number.

It is an amenable number.

11721265 is a deficient number, since it is larger than the sum of its proper divisors (2344259).

11721265 is an equidigital number, since it uses as much as digits as its factorization.

11721265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344258.

The product of its digits is 840, while the sum is 25.

The square root of 11721265 is about 3423.6333039623. The cubic root of 11721265 is about 227.1563220379.

Adding to 11721265 its reverse (56212711), we get a palindrome (67933976).

The spelling of 11721265 in words is "eleven million, seven hundred twenty-one thousand, two hundred sixty-five".