11164561 has 2 divisors, whose sum is σ = 11164562. Its totient is φ = 11164560.

The previous prime is 11164553. The next prime is 11164567. The reversal of 11164561 is 16546111.

11164561 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., 9828225 + 1336336 = 3135^2 + 1156^2 .

It is an emirp because it is prime and its reverse (16546111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11164561 - 2³ = 11164553 is a prime.

It is not a weakly prime, because it can be changed into another prime (11164567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5582280 + 5582281.

It is an arithmetic number, because the mean of its divisors is an integer number (5582281).

Almost surely, 2^11164561 is an apocalyptic number.

It is an amenable number.

11164561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11164561 is an equidigital number, since it uses as much as digits as its factorization.

11164561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 25.

The square root of 11164561 is about 3341.3411977827. The cubic root of 11164561 is about 223.5015556415.

The spelling of 11164561 in words is "eleven million, one hundred sixty-four thousand, five hundred sixty-one".