523643005 has 4 divisors (see below), whose sum is σ = 628371612. Its totient is φ = 418914400.

The previous prime is 523642997. The next prime is 523643009. The reversal of 523643005 is 500346325.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127712601 + 395930404 = 11301^2 + 19898^2 .

It is not a de Polignac number, because 523643005 - 2³ = 523642997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523643009) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 52364296 + ... + 52364305.

It is an arithmetic number, because the mean of its divisors is an integer number (157092903).

Almost surely, 2^523643005 is an apocalyptic number.

It is an amenable number.

523643005 is a deficient number, since it is larger than the sum of its proper divisors (104728607).

523643005 is a wasteful number, since it uses less digits than its factorization.

523643005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104728606.

The product of its (nonzero) digits is 10800, while the sum is 28.

The square root of 523643005 is about 22883.2472564538. The cubic root of 523643005 is about 806.0186710492.

The spelling of 523643005 in words is "five hundred twenty-three million, six hundred forty-three thousand, five".