1108561 has 2 divisors, whose sum is σ = 1108562. Its totient is φ = 1108560.

The previous prime is 1108559. The next prime is 1108567. The reversal of 1108561 is 1658011.

1108561 = 744² + 745².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 555025 + 553536 = 745^2 + 744^2 .

It is a cyclic number.

It is not a de Polignac number, because 1108561 - 2¹ = 1108559 is a prime.

Together with 1108559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1108567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554280 + 554281.

It is an arithmetic number, because the mean of its divisors is an integer number (554281).

2^1108561 is an apocalyptic number.

1108561 is the 745-th centered square number.

It is an amenable number.

1108561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1108561 is an equidigital number, since it uses as much as digits as its factorization.

1108561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1108561 is about 1052.8822346303. The cubic root of 1108561 is about 103.4951182867.

Multiplying 1108561 by its sum of digits (22), we get a palindrome (24388342).

The spelling of 1108561 in words is "one million, one hundred eight thousand, five hundred sixty-one".