8609003561 has 2 divisors, whose sum is σ = 8609003562. Its totient is φ = 8609003560.

The previous prime is 8609003549. The next prime is 8609003563. The reversal of 8609003561 is 1653009068.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4841376400 + 3767627161 = 69580^2 + 61381^2 .

It is a cyclic number.

It is not a de Polignac number, because 8609003561 - 2⁶ = 8609003497 is a prime.

It is a super-2 number, since 2×8609003561² (a number of 21 digits) contains 22 as substring.

Together with 8609003563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8609003563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4304501780 + 4304501781.

It is an arithmetic number, because the mean of its divisors is an integer number (4304501781).

Almost surely, 2^8609003561 is an apocalyptic number.

It is an amenable number.

8609003561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8609003561 is an equidigital number, since it uses as much as digits as its factorization.

8609003561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 8609003561 is about 92784.7162036938. The cubic root of 8609003561 is about 2049.5143454748.

The spelling of 8609003561 in words is "eight billion, six hundred nine million, three thousand, five hundred sixty-one".