2005801783 has 4 divisors (see below), whose sum is σ = 2060012680. Its totient is φ = 1951590888.

The previous prime is 2005801781. The next prime is 2005801807. The reversal of 2005801783 is 3871085002.

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 2005801783 - 2¹ = 2005801781 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 (2005801781) 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 3 ways as a sum of consecutive naturals, for example, 27105393 + ... + 27105466.

It is an arithmetic number, because the mean of its divisors is an integer number (515003170).

Almost surely, 2^2005801783 is an apocalyptic number.

2005801783 is a deficient number, since it is larger than the sum of its proper divisors (54210897).

2005801783 is an equidigital number, since it uses as much as digits as its factorization.

2005801783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54210896.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 2005801783 is about 44786.1784817593. The cubic root of 2005801783 is about 1261.1381718277.

Adding to 2005801783 its reverse (3871085002), we get a palindrome (5876886785).

It can be divided in two parts, 200580 and 1783, that multiplied together give a triangular number (357634140 = T₂₆₇₄₄).

The spelling of 2005801783 in words is "two billion, five million, eight hundred one thousand, seven hundred eighty-three".