2105815291 has 2 divisors, whose sum is σ = 2105815292. Its totient is φ = 2105815290.

The previous prime is 2105815267. The next prime is 2105815303. The reversal of 2105815291 is 1925185012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2105815291 - 2⁵ = 2105815259 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105825291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052907645 + 1052907646.

It is an arithmetic number, because the mean of its divisors is an integer number (1052907646).

Almost surely, 2^2105815291 is an apocalyptic number.

2105815291 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105815291 is an equidigital number, since it uses as much as digits as its factorization.

2105815291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 34.

The square root of 2105815291 is about 45889.1631106953. The cubic root of 2105815291 is about 1281.7601296003.

The spelling of 2105815291 in words is "two billion, one hundred five million, eight hundred fifteen thousand, two hundred ninety-one".