8561869 has 2 divisors, whose sum is σ = 8561870. Its totient is φ = 8561868.

The previous prime is 8561867. The next prime is 8561887. The reversal of 8561869 is 9681658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5008644 + 3553225 = 2238^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 8561869 - 2¹ = 8561867 is a prime.

It is a super-2 number, since 2×8561869² = 146611201546322, which contains 22 as substring.

Together with 8561867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8561867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4280934 + 4280935.

It is an arithmetic number, because the mean of its divisors is an integer number (4280935).

Almost surely, 2^8561869 is an apocalyptic number.

It is an amenable number.

8561869 is a deficient number, since it is larger than the sum of its proper divisors (1).

8561869 is an equidigital number, since it uses as much as digits as its factorization.

8561869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 8561869 is about 2926.0671557570. The cubic root of 8561869 is about 204.5767113566.

The spelling of 8561869 in words is "eight million, five hundred sixty-one thousand, eight hundred sixty-nine".