2045903999 has 4 divisors (see below), whose sum is σ = 2046027720. Its totient is φ = 2045780280.

The previous prime is 2045903989. The next prime is 2045904043. The reversal of 2045903999 is 9993095402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9993095402 = 2 ⋅4996547701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2045903999 is a prime.

It is a super-3 number, since 3×2045903999³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045903939) 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, 32369 + ... + 71690.

It is an arithmetic number, because the mean of its divisors is an integer number (511506930).

Almost surely, 2^2045903999 is an apocalyptic number.

2045903999 is a deficient number, since it is larger than the sum of its proper divisors (123721).

2045903999 is a wasteful number, since it uses less digits than its factorization.

2045903999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123720.

The product of its (nonzero) digits is 787320, while the sum is 50.

The square root of 2045903999 is about 45231.6703096403. The cubic root of 2045903999 is about 1269.4874652859.

The spelling of 2045903999 in words is "two billion, forty-five million, nine hundred three thousand, nine hundred ninety-nine".