521144231 has 16 divisors (see below), whose sum is σ = 557409600. Its totient is φ = 485534208.

The previous prime is 521144209. The next prime is 521144243. The reversal of 521144231 is 132441125.

It is a cyclic number.

It is not a de Polignac number, because 521144231 - 2²⁶ = 454035367 is a prime.

It is a super-2 number, since 2×521144231² = 543182619009162722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 521144197 and 521144206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521144201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1023605 + ... + 1024113.

It is an arithmetic number, because the mean of its divisors is an integer number (34838100).

Almost surely, 2^521144231 is an apocalyptic number.

521144231 is a deficient number, since it is larger than the sum of its proper divisors (36265369).

521144231 is a wasteful number, since it uses less digits than its factorization.

521144231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018.

The product of its digits is 960, while the sum is 23.

The square root of 521144231 is about 22828.5836398144. The cubic root of 521144231 is about 804.7345451398.

Adding to 521144231 its reverse (132441125), we get a palindrome (653585356).

The spelling of 521144231 in words is "five hundred twenty-one million, one hundred forty-four thousand, two hundred thirty-one".