2105171491 has 2 divisors, whose sum is σ = 2105171492. Its totient is φ = 2105171490.

The previous prime is 2105171459. The next prime is 2105171521. The reversal of 2105171491 is 1941715012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2105171491 - 2⁵ = 2105171459 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105171191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052585745 + 1052585746.

It is an arithmetic number, because the mean of its divisors is an integer number (1052585746).

Almost surely, 2^2105171491 is an apocalyptic number.

2105171491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105171491 is an equidigital number, since it uses as much as digits as its factorization.

2105171491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 2105171491 is about 45882.1478464119. The cubic root of 2105171491 is about 1281.6294943251.

The spelling of 2105171491 in words is "two billion, one hundred five million, one hundred seventy-one thousand, four hundred ninety-one".