11721616 has 10 divisors (see below), whose sum is σ = 22710662. Its totient is φ = 5860800.

The previous prime is 11721607. The next prime is 11721623. The reversal of 11721616 is 61612711.

It is a happy number.

11721616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7311616 + 4410000 = 2704^2 + 2100^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 366285 + ... + 366316.

Almost surely, 2^11721616 is an apocalyptic number.

11721616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11721616 is a deficient number, since it is larger than the sum of its proper divisors (10989046).

11721616 is an equidigital number, since it uses as much as digits as its factorization.

11721616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732609 (or 732603 counting only the distinct ones).

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

The square root of 11721616 is about 3423.6845649096. The cubic root of 11721616 is about 227.1585894573.

The spelling of 11721616 in words is "eleven million, seven hundred twenty-one thousand, six hundred sixteen".