2045208691 has 18 divisors (see below), whose sum is σ = 2165072420. Its totient is φ = 1931806800.

The previous prime is 2045208689. The next prime is 2045208703. The reversal of 2045208691 is 1968025402.

It is not a de Polignac number, because 2045208691 - 2¹ = 2045208689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2045208691.

It is not an unprimeable number, because it can be changed into a prime (2045208091) 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, 5396140 + ... + 5396518.

Almost surely, 2^2045208691 is an apocalyptic number.

2045208691 is a deficient number, since it is larger than the sum of its proper divisors (119863729).

2045208691 is an equidigital number, since it uses as much as digits as its factorization.

2045208691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 2045208691 is about 45223.9835817235. The cubic root of 2045208691 is about 1269.3436356627.

The spelling of 2045208691 in words is "two billion, forty-five million, two hundred eight thousand, six hundred ninety-one".