2081700891 has 30 divisors (see below), whose sum is σ = 3133417452. Its totient is φ = 1377265680.

The previous prime is 2081700877. The next prime is 2081700893. The reversal of 2081700891 is 1980071802.

It is not a de Polignac number, because 2081700891 - 2¹⁸ = 2081438747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2081700893) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 5964585 + ... + 5964933.

Almost surely, 2^2081700891 is an apocalyptic number.

2081700891 is a deficient number, since it is larger than the sum of its proper divisors (1051716561).

2081700891 is an frugal number, since it uses more digits than its factorization.

2081700891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 2081700891 is about 45625.6604445349. The cubic root of 2081700891 is about 1276.8487118990.

The spelling of 2081700891 in words is "two billion, eighty-one million, seven hundred thousand, eight hundred ninety-one".