2105661829 has 2 divisors, whose sum is σ = 2105661830. Its totient is φ = 2105661828.

The previous prime is 2105661821. The next prime is 2105661851. The reversal of 2105661829 is 9281665012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1856748100 + 248913729 = 43090^2 + 15777^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105661829 - 2³ = 2105661821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2105661791 and 2105661800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105661821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052830914 + 1052830915.

It is an arithmetic number, because the mean of its divisors is an integer number (1052830915).

Almost surely, 2^2105661829 is an apocalyptic number.

It is an amenable number.

2105661829 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105661829 is an equidigital number, since it uses as much as digits as its factorization.

2105661829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 2105661829 is about 45887.4909861064. The cubic root of 2105661829 is about 1281.7289926099.

The spelling of 2105661829 in words is "two billion, one hundred five million, six hundred sixty-one thousand, eight hundred twenty-nine".