11553721 has 4 divisors (see below), whose sum is σ = 11577744. Its totient is φ = 11529700.

The previous prime is 11553719. The next prime is 11553733. The reversal of 11553721 is 12735511.

11553721 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11553721 - 2¹ = 11553719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11554721) 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, 11275 + ... + 12256.

It is an arithmetic number, because the mean of its divisors is an integer number (2894436).

Almost surely, 2^11553721 is an apocalyptic number.

It is an amenable number.

11553721 is a deficient number, since it is larger than the sum of its proper divisors (24023).

11553721 is an equidigital number, since it uses as much as digits as its factorization.

11553721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24022.

The product of its digits is 1050, while the sum is 25.

The square root of 11553721 is about 3399.0764922255. The cubic root of 11553721 is about 226.0687980694.

The spelling of 11553721 in words is "eleven million, five hundred fifty-three thousand, seven hundred twenty-one".