11724721 has 2 divisors, whose sum is σ = 11724722. Its totient is φ = 11724720.

The previous prime is 11724719. The next prime is 11724731. The reversal of 11724721 is 12742711.

11724721 is digitally balanced in base 3, 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., 6150400 + 5574321 = 2480^2 + 2361^2 .

It is a cyclic number.

It is not a de Polignac number, because 11724721 - 2¹ = 11724719 is a prime.

Together with 11724719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11724731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5862360 + 5862361.

It is an arithmetic number, because the mean of its divisors is an integer number (5862361).

Almost surely, 2^11724721 is an apocalyptic number.

It is an amenable number.

11724721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11724721 is an equidigital number, since it uses as much as digits as its factorization.

11724721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 784, while the sum is 25.

The square root of 11724721 is about 3424.1379937146. The cubic root of 11724721 is about 227.1786454277.

The spelling of 11724721 in words is "eleven million, seven hundred twenty-four thousand, seven hundred twenty-one".