109000561 has 2 divisors, whose sum is σ = 109000562. Its totient is φ = 109000560.

The previous prime is 109000559. The next prime is 109000601. The reversal of 109000561 is 165000901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106998336 + 2002225 = 10344^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 109000561 - 2¹ = 109000559 is a prime.

It is a super-2 number, since 2×109000561² = 23762244596629442, which contains 22 as substring.

Together with 109000559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (109006561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54500280 + 54500281.

It is an arithmetic number, because the mean of its divisors is an integer number (54500281).

Almost surely, 2^109000561 is an apocalyptic number.

It is an amenable number.

109000561 is a deficient number, since it is larger than the sum of its proper divisors (1).

109000561 is an equidigital number, since it uses as much as digits as its factorization.

109000561 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 22.

The square root of 109000561 is about 10440.3333759033. Note that the first 4 decimals coincide. The cubic root of 109000561 is about 477.6864376178.

It can be divided in two parts, 109000 and 561, that added together give a square (109561 = 331²).

The spelling of 109000561 in words is "one hundred nine million, five hundred sixty-one", and thus it is an aban number.