521844121 has 8 divisors (see below), whose sum is σ = 554457960. Its totient is φ = 491142784.

The previous prime is 521844119. The next prime is 521844131. The reversal of 521844121 is 121448125.

It can be written as a sum of positive squares in 4 ways, for example, as 28515600 + 493328521 = 5340^2 + 22211^2 .

It is not a de Polignac number, because 521844121 - 2¹ = 521844119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521844121.

It is not an unprimeable number, because it can be changed into a prime (521844131) 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 7 ways as a sum of consecutive naturals, for example, 48196 + ... + 58021.

It is an arithmetic number, because the mean of its divisors is an integer number (69307245).

Almost surely, 2^521844121 is an apocalyptic number.

It is an amenable number.

521844121 is a deficient number, since it is larger than the sum of its proper divisors (32613839).

521844121 is an equidigital number, since it uses as much as digits as its factorization.

521844121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106268 (or 106234 counting only the distinct ones).

The product of its digits is 2560, while the sum is 28.

The square root of 521844121 is about 22843.9077436414. The cubic root of 521844121 is about 805.0946333715.

The spelling of 521844121 in words is "five hundred twenty-one million, eight hundred forty-four thousand, one hundred twenty-one".