6861559 has 2 divisors, whose sum is σ = 6861560. Its totient is φ = 6861558.

The previous prime is 6861499. The next prime is 6861581. The reversal of 6861559 is 9551686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6861559 - 2⁷ = 6861431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6865559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3430779 + 3430780.

It is an arithmetic number, because the mean of its divisors is an integer number (3430780).

Almost surely, 2^6861559 is an apocalyptic number.

6861559 is a deficient number, since it is larger than the sum of its proper divisors (1).

6861559 is an equidigital number, since it uses as much as digits as its factorization.

6861559 is an evil number, because the sum of its binary digits is even.

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

The square root of 6861559 is about 2619.4577683177. The cubic root of 6861559 is about 190.0236258709.

The spelling of 6861559 in words is "six million, eight hundred sixty-one thousand, five hundred fifty-nine".