6531220605 has 32 divisors (see below), whose sum is σ = 12861483264. Its totient is φ = 2756030976.

The previous prime is 6531220573. The next prime is 6531220609. The reversal of 6531220605 is 5060221356.

It is not a de Polignac number, because 6531220605 - 2⁵ = 6531220573 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6531220609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2391024 + ... + 2393753.

It is an arithmetic number, because the mean of its divisors is an integer number (401921352).

Almost surely, 2^6531220605 is an apocalyptic number.

6531220605 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6531220605 is a deficient number, since it is larger than the sum of its proper divisors (6330262659).

6531220605 is a wasteful number, since it uses less digits than its factorization.

6531220605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4784805.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 6531220605 is about 80815.9675126147. The cubic root of 6531220605 is about 1869.2387881422.

The spelling of 6531220605 in words is "six billion, five hundred thirty-one million, two hundred twenty thousand, six hundred five".