523973209 has 4 divisors (see below), whose sum is σ = 524070820. Its totient is φ = 523875600.

The previous prime is 523973179. The next prime is 523973221. The reversal of 523973209 is 902379325.

It is a happy number.

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 496041984 + 27931225 = 22272^2 + 5285^2 .

It is a cyclic number.

It is not a de Polignac number, because 523973209 - 2⁷ = 523973081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (523973239) 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, 40254 + ... + 51655.

It is an arithmetic number, because the mean of its divisors is an integer number (131017705).

Almost surely, 2^523973209 is an apocalyptic number.

It is an amenable number.

523973209 is a deficient number, since it is larger than the sum of its proper divisors (97611).

523973209 is an equidigital number, since it uses as much as digits as its factorization.

523973209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97610.

The product of its (nonzero) digits is 102060, while the sum is 40.

The square root of 523973209 is about 22890.4610919046. The cubic root of 523973209 is about 806.1880578657.

The spelling of 523973209 in words is "five hundred twenty-three million, nine hundred seventy-three thousand, two hundred nine".