1103561 has 2 divisors, whose sum is σ = 1103562. Its totient is φ = 1103560.

The previous prime is 1103549. The next prime is 1103579. The reversal of 1103561 is 1653011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 883600 + 219961 = 940^2 + 469^2 .

It is an emirp because it is prime and its reverse (1653011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1103561 - 2⁶ = 1103497 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1103581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551780 + 551781.

It is an arithmetic number, because the mean of its divisors is an integer number (551781).

2^1103561 is an apocalyptic number.

It is an amenable number.

1103561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1103561 is an equidigital number, since it uses as much as digits as its factorization.

1103561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1103561 is about 1050.5051165987. The cubic root of 1103561 is about 103.3392839676.

Adding to 1103561 its reverse (1653011), we get a palindrome (2756572).

The spelling of 1103561 in words is "one million, one hundred three thousand, five hundred sixty-one".