2091808357 has 18 divisors (see below), whose sum is σ = 2199528882. Its totient is φ = 1987903296.

The previous prime is 2091808351. The next prime is 2091808379. The reversal of 2091808357 is 7538081902.

It can be written as a sum of positive squares in 3 ways, for example, as 843670116 + 1248138241 = 29046^2 + 35329^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2091808357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091808351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 20308768 + ... + 20308870.

It is an arithmetic number, because the mean of its divisors is an integer number (122196049).

Almost surely, 2^2091808357 is an apocalyptic number.

It is an amenable number.

2091808357 is a deficient number, since it is larger than the sum of its proper divisors (107720525).

2091808357 is an frugal number, since it uses more digits than its factorization.

2091808357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 2091808357 is about 45736.2914653123. The cubic root of 2091808357 is about 1278.9119083548.

The spelling of 2091808357 in words is "two billion, ninety-one million, eight hundred eight thousand, three hundred fifty-seven".