11601721 has 2 divisors, whose sum is σ = 11601722. Its totient is φ = 11601720.

The previous prime is 11601679. The next prime is 11601731. The reversal of 11601721 is 12710611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10725625 + 876096 = 3275^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 11601721 - 2⁷ = 11601593 is a prime.

It is not a weakly prime, because it can be changed into another prime (11601731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5800860 + 5800861.

It is an arithmetic number, because the mean of its divisors is an integer number (5800861).

Almost surely, 2^11601721 is an apocalyptic number.

It is an amenable number.

11601721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11601721 is an equidigital number, since it uses as much as digits as its factorization.

11601721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 11601721 is about 3406.1299153144. The cubic root of 11601721 is about 226.3814335580.

The spelling of 11601721 in words is "eleven million, six hundred one thousand, seven hundred twenty-one".