11167561 has 2 divisors, whose sum is σ = 11167562. Its totient is φ = 11167560.

The previous prime is 11167553. The next prime is 11167571. The reversal of 11167561 is 16576111.

11167561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11022400 + 145161 = 3320^2 + 381^2 .

It is a cyclic number.

It is not a de Polignac number, because 11167561 - 2³ = 11167553 is a prime.

It is not a weakly prime, because it can be changed into another prime (11167511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5583780 + 5583781.

It is an arithmetic number, because the mean of its divisors is an integer number (5583781).

Almost surely, 2^11167561 is an apocalyptic number.

It is an amenable number.

11167561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11167561 is an equidigital number, since it uses as much as digits as its factorization.

11167561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 28.

The square root of 11167561 is about 3341.7900891588. The cubic root of 11167561 is about 223.5215726883.

The spelling of 11167561 in words is "eleven million, one hundred sixty-seven thousand, five hundred sixty-one".