523121 has 4 divisors (see below), whose sum is σ = 528612. Its totient is φ = 517632.

The previous prime is 523109. The next prime is 523129. The reversal of 523121 is 121325.

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 390625 + 132496 = 625^2 + 364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 523096 and 523105.

It is not an unprimeable number, because it can be changed into a prime (523129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2600 + ... + 2793.

It is an arithmetic number, because the mean of its divisors is an integer number (132153).

2⁵²³¹²¹ is an apocalyptic number.

It is an amenable number.

523121 is a deficient number, since it is larger than the sum of its proper divisors (5491).

523121 is an equidigital number, since it uses as much as digits as its factorization.

523121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5490.

The product of its digits is 60, while the sum is 14.

The square root of 523121 is about 723.2710418647. The cubic root of 523121 is about 80.5750749546.

Adding to 523121 its reverse (121325), we get a palindrome (644446).

The spelling of 523121 in words is "five hundred twenty-three thousand, one hundred twenty-one".