6599861 has 2 divisors, whose sum is σ = 6599862. Its totient is φ = 6599860.

The previous prime is 6599839. The next prime is 6599891. The reversal of 6599861 is 1689956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6599761 + 100 = 2569^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 6599861 - 2⁶ = 6599797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6599891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3299930 + 3299931.

It is an arithmetic number, because the mean of its divisors is an integer number (3299931).

Almost surely, 2^6599861 is an apocalyptic number.

It is an amenable number.

6599861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6599861 is an equidigital number, since it uses as much as digits as its factorization.

6599861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 44.

The square root of 6599861 is about 2569.0194627523. The cubic root of 6599861 is about 187.5764286938.

The spelling of 6599861 in words is "six million, five hundred ninety-nine thousand, eight hundred sixty-one".