2105051209 has 2 divisors, whose sum is σ = 2105051210. Its totient is φ = 2105051208.

The previous prime is 2105051119. The next prime is 2105051227. The reversal of 2105051209 is 9021505012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1931338809 + 173712400 = 43947^2 + 13180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105051209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105051269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052525604 + 1052525605.

It is an arithmetic number, because the mean of its divisors is an integer number (1052525605).

Almost surely, 2^2105051209 is an apocalyptic number.

It is an amenable number.

2105051209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105051209 is an equidigital number, since it uses as much as digits as its factorization.

2105051209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 2105051209 is about 45880.8370564444. The cubic root of 2105051209 is about 1281.6050846122.

The spelling of 2105051209 in words is "two billion, one hundred five million, fifty-one thousand, two hundred nine".