2005531291 has 2 divisors, whose sum is σ = 2005531292. Its totient is φ = 2005531290.

The previous prime is 2005531271. The next prime is 2005531369. The reversal of 2005531291 is 1921355002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2005531291 is a prime.

It is not a weakly prime, because it can be changed into another prime (2005531201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002765645 + 1002765646.

It is an arithmetic number, because the mean of its divisors is an integer number (1002765646).

Almost surely, 2^2005531291 is an apocalyptic number.

2005531291 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005531291 is an equidigital number, since it uses as much as digits as its factorization.

2005531291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 2005531291 is about 44783.1585643532. The cubic root of 2005531291 is about 1261.0814791002.

Adding to 2005531291 its reverse (1921355002), we get a palindrome (3926886293).

The spelling of 2005531291 in words is "two billion, five million, five hundred thirty-one thousand, two hundred ninety-one".