2105983861 has 2 divisors, whose sum is σ = 2105983862. Its totient is φ = 2105983860.

The previous prime is 2105983829. The next prime is 2105983897. The reversal of 2105983861 is 1683895012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1279421361 + 826562500 = 35769^2 + 28750^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105983861 - 2⁵ = 2105983829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105983801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052991930 + 1052991931.

It is an arithmetic number, because the mean of its divisors is an integer number (1052991931).

Almost surely, 2^2105983861 is an apocalyptic number.

It is an amenable number.

2105983861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105983861 is an equidigital number, since it uses as much as digits as its factorization.

2105983861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 2105983861 is about 45890.9997820923. Note that the first 3 decimals coincide. The cubic root of 2105983861 is about 1281.7943302162.

The spelling of 2105983861 in words is "two billion, one hundred five million, nine hundred eighty-three thousand, eight hundred sixty-one".