6859561 has 2 divisors, whose sum is σ = 6859562. Its totient is φ = 6859560.

The previous prime is 6859547. The next prime is 6859571. The reversal of 6859561 is 1659586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6859161 + 400 = 2619^2 + 20^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6859561 is a prime.

It is a super-2 number, since 2×6859561² = 94107154225442, which contains 22 as substring.

It is equal to p₄₆₇₆₈₉ and since 6859561 and 467689 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (6859571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3429780 + 3429781.

It is an arithmetic number, because the mean of its divisors is an integer number (3429781).

Almost surely, 2^6859561 is an apocalyptic number.

It is an amenable number.

6859561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6859561 is an equidigital number, since it uses as much as digits as its factorization.

6859561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 40.

The square root of 6859561 is about 2619.0763639115. The cubic root of 6859561 is about 190.0051799142.

The spelling of 6859561 in words is "six million, eight hundred fifty-nine thousand, five hundred sixty-one".