513231320 has 32 divisors (see below), whose sum is σ = 1319738400. Its totient is φ = 175964928.

The previous prime is 513231307. The next prime is 513231353. The reversal of 513231320 is 23132315.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 513231292 and 513231301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 916205 + ... + 916764.

It is an arithmetic number, because the mean of its divisors is an integer number (41241825).

Almost surely, 2^513231320 is an apocalyptic number.

It is an amenable number.

513231320 is an abundant number, since it is smaller than the sum of its proper divisors (806507080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

513231320 is a wasteful number, since it uses less digits than its factorization.

513231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832987 (or 1832983 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 513231320 is about 22654.6092440369. The cubic root of 513231320 is about 800.6407990836.

Adding to 513231320 its reverse (23132315), we get a palindrome (536363635).

The spelling of 513231320 in words is "five hundred thirteen million, two hundred thirty-one thousand, three hundred twenty".