2108561139 has 10 divisors (see below), whose sum is σ = 3149826020. Its totient is φ = 1405707372.

The previous prime is 2108561137. The next prime is 2108561173. The reversal of 2108561139 is 9311658012.

2108561139 is a `hidden beast` number, since 2 + 1 + 0 + 8 + 5 + 611 + 39 = 666.

It is not a de Polignac number, because 2108561139 - 2¹ = 2108561137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2108561137) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13015729 + ... + 13015890.

It is an arithmetic number, because the mean of its divisors is an integer number (314982602).

Almost surely, 2^2108561139 is an apocalyptic number.

2108561139 is a deficient number, since it is larger than the sum of its proper divisors (1041264881).

2108561139 is an equidigital number, since it uses as much as digits as its factorization.

2108561139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26031631 (or 26031622 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 2108561139 is about 45919.0716260684. The cubic root of 2108561139 is about 1282.3169986141.

The spelling of 2108561139 in words is "two billion, one hundred eight million, five hundred sixty-one thousand, one hundred thirty-nine".