523431121 has 4 divisors (see below), whose sum is σ = 541480500. Its totient is φ = 505381744.

The previous prime is 523431113. The next prime is 523431143. The reversal of 523431121 is 121134325.

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 105678400 + 417752721 = 10280^2 + 20439^2 .

It is a cyclic number.

It is not a de Polignac number, because 523431121 - 2³ = 523431113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 523431092 and 523431101.

It is not an unprimeable number, because it can be changed into a prime (523431191) 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, 9024646 + ... + 9024703.

It is an arithmetic number, because the mean of its divisors is an integer number (135370125).

Almost surely, 2^523431121 is an apocalyptic number.

It is an amenable number.

523431121 is a deficient number, since it is larger than the sum of its proper divisors (18049379).

523431121 is a wasteful number, since it uses less digits than its factorization.

523431121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18049378.

The product of its digits is 720, while the sum is 22.

The square root of 523431121 is about 22878.6171129288. The cubic root of 523431121 is about 805.9099420751.

Adding to 523431121 its reverse (121134325), we get a palindrome (644565446).

The spelling of 523431121 in words is "five hundred twenty-three million, four hundred thirty-one thousand, one hundred twenty-one".