2861861 has 2 divisors, whose sum is σ = 2861862. Its totient is φ = 2861860.

The previous prime is 2861851. The next prime is 2861869. The reversal of 2861861 is 1681682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2825761 + 36100 = 1681^2 + 190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2861861 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 (2861869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1430930 + 1430931.

It is an arithmetic number, because the mean of its divisors is an integer number (1430931).

2^2861861 is an apocalyptic number.

It is an amenable number.

2861861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2861861 is an equidigital number, since it uses as much as digits as its factorization.

2861861 is an evil number, because the sum of its binary digits is even.

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

The square root of 2861861 is about 1691.7035792360. The cubic root of 2861861 is about 141.9764061838.

The spelling of 2861861 in words is "two million, eight hundred sixty-one thousand, eight hundred sixty-one".