2005530251 has 4 divisors (see below), whose sum is σ = 2009881104. Its totient is φ = 2001179400.

The previous prime is 2005530227. The next prime is 2005530257. The reversal of 2005530251 is 1520355002.

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 2005530251 - 2⁶ = 2005530187 is a prime.

It is a super-2 number, since 2×2005530251² = 8044303175352246002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2005530257) 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, 2174735 + ... + 2175656.

It is an arithmetic number, because the mean of its divisors is an integer number (502470276).

Almost surely, 2^2005530251 is an apocalyptic number.

2005530251 is a deficient number, since it is larger than the sum of its proper divisors (4350853).

2005530251 is an equidigital number, since it uses as much as digits as its factorization.

2005530251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350852.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 2005530251 is about 44783.1469528438. The cubic root of 2005530251 is about 1261.0812611155.

Adding to 2005530251 its reverse (1520355002), we get a palindrome (3525885253).

The spelling of 2005530251 in words is "two billion, five million, five hundred thirty thousand, two hundred fifty-one".