8003561 has 2 divisors, whose sum is σ = 8003562. Its totient is φ = 8003560.

The previous prime is 8003539. The next prime is 8003573. The reversal of 8003561 is 1653008.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5382400 + 2621161 = 2320^2 + 1619^2 .

It is a cyclic number.

It is not a de Polignac number, because 8003561 - 2⁶ = 8003497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8003521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4001780 + 4001781.

It is an arithmetic number, because the mean of its divisors is an integer number (4001781).

Almost surely, 2^8003561 is an apocalyptic number.

It is an amenable number.

8003561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8003561 is an equidigital number, since it uses as much as digits as its factorization.

8003561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 8003561 is about 2829.0565565220. The cubic root of 8003561 is about 200.0296705981.

Adding to 8003561 its reverse (1653008), we get a palindrome (9656569).

The spelling of 8003561 in words is "eight million, three thousand, five hundred sixty-one".