11443721 has 2 divisors, whose sum is σ = 11443722. Its totient is φ = 11443720.

The previous prime is 11443717. The next prime is 11443723. The reversal of 11443721 is 12734411.

It is a happy number.

11443721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 19321 = 3380^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 11443721 - 2² = 11443717 is a prime.

Together with 11443723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11443723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5721860 + 5721861.

It is an arithmetic number, because the mean of its divisors is an integer number (5721861).

Almost surely, 2^11443721 is an apocalyptic number.

It is an amenable number.

11443721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11443721 is an equidigital number, since it uses as much as digits as its factorization.

11443721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 23.

The square root of 11443721 is about 3382.8569286921. The cubic root of 11443721 is about 225.3490614836.

The spelling of 11443721 in words is "eleven million, four hundred forty-three thousand, seven hundred twenty-one".