8561939 has 2 divisors, whose sum is σ = 8561940. Its totient is φ = 8561938.

The previous prime is 8561909. The next prime is 8561953. The reversal of 8561939 is 9391658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8561939 - 2¹⁶ = 8496403 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 8⁷ + 5 + 6⁸ + 1 + 9 + 3⁷ + 9⁷ .

It is a junction number, because it is equal to n+sod(n) for n = 8561896 and 8561905.

It is not a weakly prime, because it can be changed into another prime (8561909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4280969 + 4280970.

It is an arithmetic number, because the mean of its divisors is an integer number (4280970).

Almost surely, 2^8561939 is an apocalyptic number.

8561939 is a deficient number, since it is larger than the sum of its proper divisors (1).

8561939 is an equidigital number, since it uses as much as digits as its factorization.

8561939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 8561939 is about 2926.0791171805. The cubic root of 8561939 is about 204.5772688801.

It can be divided in two parts, 85619 and 39, that added together give a palindrome (85658).

The spelling of 8561939 in words is "eight million, five hundred sixty-one thousand, nine hundred thirty-nine".