2105881 has 2 divisors, whose sum is σ = 2105882. Its totient is φ = 2105880.

The previous prime is 2105863. The next prime is 2105891. The reversal of 2105881 is 1885012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2059225 + 46656 = 1435^2 + 216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105881 is a prime.

It is a super-2 number, since 2×2105881² = 8869469572322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2105891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052940 + 1052941.

It is an arithmetic number, because the mean of its divisors is an integer number (1052941).

2^2105881 is an apocalyptic number.

It is an amenable number.

2105881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105881 is an equidigital number, since it uses as much as digits as its factorization.

2105881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 2105881 is about 1451.1653937439. The cubic root of 2105881 is about 128.1773461301.

The spelling of 2105881 in words is "two million, one hundred five thousand, eight hundred eighty-one".