1109000561 has 2 divisors, whose sum is σ = 1109000562. Its totient is φ = 1109000560.

The previous prime is 1109000551. The next prime is 1109000623. The reversal of 1109000561 is 1650009011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1032979600 + 76020961 = 32140^2 + 8719^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109000561 - 2¹⁸ = 1108738417 is a prime.

It is not a weakly prime, because it can be changed into another prime (1109000551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554500280 + 554500281.

It is an arithmetic number, because the mean of its divisors is an integer number (554500281).

Almost surely, 2^1109000561 is an apocalyptic number.

It is an amenable number.

1109000561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109000561 is an equidigital number, since it uses as much as digits as its factorization.

1109000561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 1109000561 is about 33301.6600336980. The cubic root of 1109000561 is about 1035.0879559938.

Adding to 1109000561 its reverse (1650009011), we get a palindrome (2759009572).

The spelling of 1109000561 in words is "one billion, one hundred nine million, five hundred sixty-one", and thus it is an aban number.