523431021 has 8 divisors (see below), whose sum is σ = 711076320. Its totient is φ = 342369872.

The previous prime is 523431017. The next prime is 523431023. The reversal of 523431021 is 120134325.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 523431021 - 2² = 523431017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523431023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1645851 + ... + 1646168.

It is an arithmetic number, because the mean of its divisors is an integer number (88884540).

Almost surely, 2^523431021 is an apocalyptic number.

It is an amenable number.

523431021 is a deficient number, since it is larger than the sum of its proper divisors (187645299).

523431021 is a wasteful number, since it uses less digits than its factorization.

523431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3292075.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 523431021 is about 22878.6149274820. The cubic root of 523431021 is about 805.9098907528.

Adding to 523431021 its reverse (120134325), we get a palindrome (643565346).

The spelling of 523431021 in words is "five hundred twenty-three million, four hundred thirty-one thousand, twenty-one".