11749721 has 2 divisors, whose sum is σ = 11749722. Its totient is φ = 11749720.

The previous prime is 11749709. The next prime is 11749741. The reversal of 11749721 is 12794711.

11749721 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., 6574096 + 5175625 = 2564^2 + 2275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11749721 is a prime.

It is not a weakly prime, because it can be changed into another prime (11749741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5874860 + 5874861.

It is an arithmetic number, because the mean of its divisors is an integer number (5874861).

Almost surely, 2^11749721 is an apocalyptic number.

It is an amenable number.

11749721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11749721 is an equidigital number, since it uses as much as digits as its factorization.

11749721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 32.

The square root of 11749721 is about 3427.7866036263. The cubic root of 11749721 is about 227.3399977884.

The spelling of 11749721 in words is "eleven million, seven hundred forty-nine thousand, seven hundred twenty-one".