2005812145 has 8 divisors (see below), whose sum is σ = 2417486760. Its totient is φ = 1597641600.

The previous prime is 2005812131. The next prime is 2005812163. The reversal of 2005812145 is 5412185002.

It can be written as a sum of positive squares in 4 ways, for example, as 652087296 + 1353724849 = 25536^2 + 36793^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2005812145 - 2¹⁹ = 2005287857 is a prime.

It is a super-2 number, since 2×2005812145² = 8046564722059002050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 874756 + ... + 877045.

It is an arithmetic number, because the mean of its divisors is an integer number (302185845).

Almost surely, 2^2005812145 is an apocalyptic number.

It is an amenable number.

2005812145 is a deficient number, since it is larger than the sum of its proper divisors (411674615).

2005812145 is a wasteful number, since it uses less digits than its factorization.

2005812145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752035.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 2005812145 is about 44786.2941646214. The cubic root of 2005812145 is about 1261.1403435097.

Adding to 2005812145 its reverse (5412185002), we get a palindrome (7417997147).

It can be divided in two parts, 200 and 5812145, that added together give a triangular number (5812345 = T₃₄₀₉).

The spelling of 2005812145 in words is "two billion, five million, eight hundred twelve thousand, one hundred forty-five".