8561099 has 2 divisors, whose sum is σ = 8561100. Its totient is φ = 8561098.

The previous prime is 8561089. The next prime is 8561101. The reversal of 8561099 is 9901658.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8561099 is a prime.

Together with 8561101, 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 (8561089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4280549 + 4280550.

It is an arithmetic number, because the mean of its divisors is an integer number (4280550).

Almost surely, 2^8561099 is an apocalyptic number.

8561099 is a deficient number, since it is larger than the sum of its proper divisors (1).

8561099 is an equidigital number, since it uses as much as digits as its factorization.

8561099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 8561099 is about 2925.9355768711. The cubic root of 8561099 is about 204.5705783969.

The spelling of 8561099 in words is "eight million, five hundred sixty-one thousand, ninety-nine".