2105953309409 has 2 divisors, whose sum is σ = 2105953309410. Its totient is φ = 2105953309408.

The previous prime is 2105953309393. The next prime is 2105953309433. The reversal of 2105953309409 is 9049033595012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2105575123600 + 378185809 = 1451060^2 + 19447^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105953309409 - 2⁴ = 2105953309393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105953303409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052976654704 + 1052976654705.

It is an arithmetic number, because the mean of its divisors is an integer number (1052976654705).

Almost surely, 2^{2105953309409} is an apocalyptic number.

It is an amenable number.

2105953309409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105953309409 is an equidigital number, since it uses as much as digits as its factorization.

2105953309409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1312200, while the sum is 50.

The spelling of 2105953309409 in words is "two trillion, one hundred five billion, nine hundred fifty-three million, three hundred nine thousand, four hundred nine".