11721065 has 8 divisors (see below), whose sum is σ = 14127048. Its totient is φ = 9335680.

The previous prime is 11721049. The next prime is 11721077. The reversal of 11721065 is 56012711.

It can be written as a sum of positive squares in 4 ways, for example, as 458329 + 11262736 = 677^2 + 3356^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11721065 - 2⁴ = 11721049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11721065.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3866 + ... + 6195.

It is an arithmetic number, because the mean of its divisors is an integer number (1765881).

Almost surely, 2^11721065 is an apocalyptic number.

It is an amenable number.

11721065 is a deficient number, since it is larger than the sum of its proper divisors (2405983).

11721065 is a wasteful number, since it uses less digits than its factorization.

11721065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10299.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 11721065 is about 3423.6040951021. The cubic root of 11721065 is about 227.1550300407.

Adding to 11721065 its reverse (56012711), we get a palindrome (67733776).

The spelling of 11721065 in words is "eleven million, seven hundred twenty-one thousand, sixty-five".