11409721 has 2 divisors, whose sum is σ = 11409722. Its totient is φ = 11409720.

The previous prime is 11409691. The next prime is 11409757. The reversal of 11409721 is 12790411.

11409721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10112400 + 1297321 = 3180^2 + 1139^2 .

It is an emirp because it is prime and its reverse (12790411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11409721 - 2⁵ = 11409689 is a prime.

It is not a weakly prime, because it can be changed into another prime (11409121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5704860 + 5704861.

It is an arithmetic number, because the mean of its divisors is an integer number (5704861).

Almost surely, 2^11409721 is an apocalyptic number.

It is an amenable number.

11409721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11409721 is an equidigital number, since it uses as much as digits as its factorization.

11409721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 11409721 is about 3377.8278523335. The cubic root of 11409721 is about 225.1256647813.

The spelling of 11409721 in words is "eleven million, four hundred nine thousand, seven hundred twenty-one".