103889561 has 2 divisors, whose sum is σ = 103889562. Its totient is φ = 103889560.

The previous prime is 103889537. The next prime is 103889563. The reversal of 103889561 is 165988301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101505625 + 2383936 = 10075^2 + 1544^2 .

It is an emirp because it is prime and its reverse (165988301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103889561 - 2⁶ = 103889497 is a prime.

It is a Sophie Germain prime.

Together with 103889563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (103889563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51944780 + 51944781.

It is an arithmetic number, because the mean of its divisors is an integer number (51944781).

Almost surely, 2^103889561 is an apocalyptic number.

It is an amenable number.

103889561 is a deficient number, since it is larger than the sum of its proper divisors (1).

103889561 is an equidigital number, since it uses as much as digits as its factorization.

103889561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 103889561 is about 10192.6228714693. The cubic root of 103889561 is about 470.1004176565.

The spelling of 103889561 in words is "one hundred three million, eight hundred eighty-nine thousand, five hundred sixty-one".