513409823 has 4 divisors (see below), whose sum is σ = 531113640. Its totient is φ = 495706008.

The previous prime is 513409801. The next prime is 513409847. The reversal of 513409823 is 328904315.

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

It is a cyclic number.

It is not a de Polignac number, because 513409823 - 2²⁴ = 496632607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513409873) 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, 8851865 + ... + 8851922.

It is an arithmetic number, because the mean of its divisors is an integer number (132778410).

Almost surely, 2^513409823 is an apocalyptic number.

513409823 is a deficient number, since it is larger than the sum of its proper divisors (17703817).

513409823 is a wasteful number, since it uses less digits than its factorization.

513409823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17703816.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 513409823 is about 22658.5485634010. The cubic root of 513409823 is about 800.7336098776.

The spelling of 513409823 in words is "five hundred thirteen million, four hundred nine thousand, eight hundred twenty-three".