11572721 has 2 divisors, whose sum is σ = 11572722. Its totient is φ = 11572720.

The previous prime is 11572679. The next prime is 11572739. The reversal of 11572721 is 12727511.

11572721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10491121 + 1081600 = 3239^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 11572721 - 2¹⁸ = 11310577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11572741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5786360 + 5786361.

It is an arithmetic number, because the mean of its divisors is an integer number (5786361).

Almost surely, 2^11572721 is an apocalyptic number.

It is an amenable number.

11572721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11572721 is an equidigital number, since it uses as much as digits as its factorization.

11572721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 980, while the sum is 26.

The square root of 11572721 is about 3401.8702209226. The cubic root of 11572721 is about 226.1926529666.

The spelling of 11572721 in words is "eleven million, five hundred seventy-two thousand, seven hundred twenty-one".