2816861 has 2 divisors, whose sum is σ = 2816862. Its totient is φ = 2816860.

The previous prime is 2816839. The next prime is 2816873. The reversal of 2816861 is 1686182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2805625 + 11236 = 1675^2 + 106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2816861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2816831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1408430 + 1408431.

It is an arithmetic number, because the mean of its divisors is an integer number (1408431).

2^2816861 is an apocalyptic number.

It is an amenable number.

2816861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2816861 is an equidigital number, since it uses as much as digits as its factorization.

2816861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 32.

The square root of 2816861 is about 1678.3506784936. The cubic root of 2816861 is about 141.2283241336.

The spelling of 2816861 in words is "two million, eight hundred sixteen thousand, eight hundred sixty-one".