2045913691 has 4 divisors (see below), whose sum is σ = 2053143352. Its totient is φ = 2038684032.

The previous prime is 2045913689. The next prime is 2045913697. The reversal of 2045913691 is 1963195402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2045913691 - 2¹ = 2045913689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2045913697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3614406 + ... + 3614971.

It is an arithmetic number, because the mean of its divisors is an integer number (513285838).

Almost surely, 2^2045913691 is an apocalyptic number.

2045913691 is a deficient number, since it is larger than the sum of its proper divisors (7229661).

2045913691 is an equidigital number, since it uses as much as digits as its factorization.

2045913691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7229660.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 2045913691 is about 45231.7774468349. Note that the first 3 decimals coincide. The cubic root of 2045913691 is about 1269.4894699177.

The spelling of 2045913691 in words is "two billion, forty-five million, nine hundred thirteen thousand, six hundred ninety-one".