513213390823 has 4 divisors (see below), whose sum is σ = 586529589520. Its totient is φ = 439897192128.

The previous prime is 513213390817. The next prime is 513213390829. The reversal of 513213390823 is 328093312315.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (513213390817) and next prime (513213390829).

It is a cyclic number.

It is not a de Polignac number, because 513213390823 - 2²¹ = 513211293671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513213390829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36658099338 + ... + 36658099351.

It is an arithmetic number, because the mean of its divisors is an integer number (146632397380).

Almost surely, 2^513213390823 is an apocalyptic number.

513213390823 is a deficient number, since it is larger than the sum of its proper divisors (73316198697).

513213390823 is an equidigital number, since it uses as much as digits as its factorization.

513213390823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73316198696.

The product of its (nonzero) digits is 116640, while the sum is 40.

The spelling of 513213390823 in words is "five hundred thirteen billion, two hundred thirteen million, three hundred ninety thousand, eight hundred twenty-three".