521260005 has 16 divisors (see below), whose sum is σ = 953161344. Its totient is φ = 238290240.

The previous prime is 521259989. The next prime is 521260013. The reversal of 521260005 is 500062125.

It is not a de Polignac number, because 521260005 - 2⁴ = 521259989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2482086 + ... + 2482295.

It is an arithmetic number, because the mean of its divisors is an integer number (59572584).

Almost surely, 2^521260005 is an apocalyptic number.

It is an amenable number.

521260005 is a deficient number, since it is larger than the sum of its proper divisors (431901339).

521260005 is a wasteful number, since it uses less digits than its factorization.

521260005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4964396.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 521260005 is about 22831.1192235510. The cubic root of 521260005 is about 804.7941322518.

The spelling of 521260005 in words is "five hundred twenty-one million, two hundred sixty thousand, five".