6869561 has 2 divisors, whose sum is σ = 6869562. Its totient is φ = 6869560.

The previous prime is 6869543. The next prime is 6869563. The reversal of 6869561 is 1659686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6760000 + 109561 = 2600^2 + 331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6869561 is a prime.

Together with 6869563, 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 (6869563) 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, 3434780 + 3434781.

It is an arithmetic number, because the mean of its divisors is an integer number (3434781).

Almost surely, 2^6869561 is an apocalyptic number.

It is an amenable number.

6869561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6869561 is an equidigital number, since it uses as much as digits as its factorization.

6869561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 6869561 is about 2620.9847386049. The cubic root of 6869561 is about 190.0974661521.

The spelling of 6869561 in words is "six million, eight hundred sixty-nine thousand, five hundred sixty-one".