2105901851 has 2 divisors, whose sum is σ = 2105901852. Its totient is φ = 2105901850.

The previous prime is 2105901821. The next prime is 2105901899. The reversal of 2105901851 is 1581095012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2105901851 - 2¹⁰ = 2105900827 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105901821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052950925 + 1052950926.

It is an arithmetic number, because the mean of its divisors is an integer number (1052950926).

Almost surely, 2^2105901851 is an apocalyptic number.

2105901851 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105901851 is an equidigital number, since it uses as much as digits as its factorization.

2105901851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 32.

The square root of 2105901851 is about 45890.1062430673. The cubic root of 2105901851 is about 1281.7776917035. Note that the first 3 decimals are identical.

Adding to 2105901851 its reverse (1581095012), we get a palindrome (3686996863).

The spelling of 2105901851 in words is "two billion, one hundred five million, nine hundred one thousand, eight hundred fifty-one".