513443231 has 16 divisors (see below), whose sum is σ = 642738240. Its totient is φ = 399920640.

The previous prime is 513443167. The next prime is 513443239. The reversal of 513443231 is 132344315.

It is not a de Polignac number, because 513443231 - 2⁶ = 513443167 is a prime.

It is a super-2 number, since 2×513443231² = 527247902919438722, which contains 22 as substring.

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 513443231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513443239) 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 15 ways as a sum of consecutive naturals, for example, 70940 + ... + 77841.

It is an arithmetic number, because the mean of its divisors is an integer number (40171140).

Almost surely, 2^513443231 is an apocalyptic number.

513443231 is a deficient number, since it is larger than the sum of its proper divisors (129295009).

513443231 is a wasteful number, since it uses less digits than its factorization.

513443231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148834.

The product of its digits is 4320, while the sum is 26.

The square root of 513443231 is about 22659.2857566164. The cubic root of 513443231 is about 800.7509776327.

Adding to 513443231 its reverse (132344315), we get a palindrome (645787546).

The spelling of 513443231 in words is "five hundred thirteen million, four hundred forty-three thousand, two hundred thirty-one".