11437721 has 2 divisors, whose sum is σ = 11437722. Its totient is φ = 11437720.

The previous prime is 11437711. The next prime is 11437733. The reversal of 11437721 is 12773411.

It is a happy number.

11437721 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., 9066121 + 2371600 = 3011^2 + 1540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11437721 is a prime.

It is not a weakly prime, because it can be changed into another prime (11437711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5718860 + 5718861.

It is an arithmetic number, because the mean of its divisors is an integer number (5718861).

Almost surely, 2^11437721 is an apocalyptic number.

It is an amenable number.

11437721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11437721 is an equidigital number, since it uses as much as digits as its factorization.

11437721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 26.

The square root of 11437721 is about 3381.9699880395. The cubic root of 11437721 is about 225.3096707196.

The spelling of 11437721 in words is "eleven million, four hundred thirty-seven thousand, seven hundred twenty-one".