2105219749 has 2 divisors, whose sum is σ = 2105219750. Its totient is φ = 2105219748.

The previous prime is 2105219717. The next prime is 2105219759. The reversal of 2105219749 is 9479125012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2077992225 + 27227524 = 45585^2 + 5218^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105219749 - 2⁵ = 2105219717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105219759) 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, 1052609874 + 1052609875.

It is an arithmetic number, because the mean of its divisors is an integer number (1052609875).

Almost surely, 2^2105219749 is an apocalyptic number.

It is an amenable number.

2105219749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105219749 is an equidigital number, since it uses as much as digits as its factorization.

2105219749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 2105219749 is about 45882.6737342104. The cubic root of 2105219749 is about 1281.6392874154.

The spelling of 2105219749 in words is "two billion, one hundred five million, two hundred nineteen thousand, seven hundred forty-nine".