523117021 has 4 divisors (see below), whose sum is σ = 597848032. Its totient is φ = 448386012.

The previous prime is 523117019. The next prime is 523117027. The reversal of 523117021 is 120711325.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 523117021 - 2¹ = 523117019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 523116983 and 523117001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523117027) 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, 37365495 + ... + 37365508.

It is an arithmetic number, because the mean of its divisors is an integer number (149462008).

Almost surely, 2^523117021 is an apocalyptic number.

It is an amenable number.

523117021 is a deficient number, since it is larger than the sum of its proper divisors (74731011).

523117021 is an equidigital number, since it uses as much as digits as its factorization.

523117021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74731010.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 523117021 is about 22871.7515944888. The cubic root of 523117021 is about 805.7487066209.

Adding to 523117021 its reverse (120711325), we get a palindrome (643828346).

The spelling of 523117021 in words is "five hundred twenty-three million, one hundred seventeen thousand, twenty-one".