523171221 has 16 divisors (see below), whose sum is σ = 722012160. Its totient is φ = 336616560.

The previous prime is 523171219. The next prime is 523171237. The reversal of 523171221 is 122171325.

It is not a de Polignac number, because 523171221 - 2¹ = 523171219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 523171191 and 523171200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523171211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27826 + ... + 42668.

It is an arithmetic number, because the mean of its divisors is an integer number (45125760).

Almost surely, 2^523171221 is an apocalyptic number.

It is an amenable number.

523171221 is a deficient number, since it is larger than the sum of its proper divisors (198840939).

523171221 is a wasteful number, since it uses less digits than its factorization.

523171221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15256.

The product of its digits is 840, while the sum is 24.

The square root of 523171221 is about 22872.9364315122. The cubic root of 523171221 is about 805.7765334550.

The spelling of 523171221 in words is "five hundred twenty-three million, one hundred seventy-one thousand, two hundred twenty-one".