2105202609 has 16 divisors (see below), whose sum is σ = 3121104000. Its totient is φ = 1402440048.

The previous prime is 2105202587. The next prime is 2105202613. The reversal of 2105202609 is 9062025012.

2105202609 is a `hidden beast` number, since 2 + 1 + 0 + 52 + 0 + 2 + 609 = 666.

It is not a de Polignac number, because 2105202609 - 2⁵ = 2105202577 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2105242609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9907 + ... + 65639.

It is an arithmetic number, because the mean of its divisors is an integer number (195069000).

Almost surely, 2^2105202609 is an apocalyptic number.

It is an amenable number.

2105202609 is a deficient number, since it is larger than the sum of its proper divisors (1015901391).

2105202609 is a wasteful number, since it uses less digits than its factorization.

2105202609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57141 (or 57135 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2105202609 is about 45882.4869530848. The cubic root of 2105202609 is about 1281.6358091788.

The spelling of 2105202609 in words is "two billion, one hundred five million, two hundred two thousand, six hundred nine".