513231321 has 8 divisors (see below), whose sum is σ = 692970880. Its totient is φ = 337822992.

The previous prime is 513231307. The next prime is 513231353. The reversal of 513231321 is 123132315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 513231321 - 2⁷ = 513231193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (513231371) 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, 1082530 + ... + 1083003.

It is an arithmetic number, because the mean of its divisors is an integer number (86621360).

Almost surely, 2^513231321 is an apocalyptic number.

It is an amenable number.

513231321 is a deficient number, since it is larger than the sum of its proper divisors (179739559).

513231321 is a wasteful number, since it uses less digits than its factorization.

513231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165615.

The product of its digits is 540, while the sum is 21.

The square root of 513231321 is about 22654.6092661074. The cubic root of 513231321 is about 800.6407996036.

Adding to 513231321 its reverse (123132315), we get a palindrome (636363636).

The spelling of 513231321 in words is "five hundred thirteen million, two hundred thirty-one thousand, three hundred twenty-one".