2108956985 has 8 divisors (see below), whose sum is σ = 2539756296. Its totient is φ = 1681160320.

The previous prime is 2108956931. The next prime is 2108956987. The reversal of 2108956985 is 5896598012.

It can be written as a sum of positive squares in 4 ways, for example, as 548074921 + 1560882064 = 23411^2 + 39508^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2108956985 - 2¹⁴ = 2108940601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2108956987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749114 + ... + 751923.

It is an arithmetic number, because the mean of its divisors is an integer number (317469537).

Almost surely, 2^2108956985 is an apocalyptic number.

It is an amenable number.

2108956985 is a deficient number, since it is larger than the sum of its proper divisors (430799311).

2108956985 is a wasteful number, since it uses less digits than its factorization.

2108956985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501323.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The square root of 2108956985 is about 45923.3816807952. The cubic root of 2108956985 is about 1282.3972378958.

The spelling of 2108956985 in words is "two billion, one hundred eight million, nine hundred fifty-six thousand, nine hundred eighty-five".