5209218823 has 4 divisors (see below), whose sum is σ = 5209364160. Its totient is φ = 5209073488.

The previous prime is 5209218793. The next prime is 5209218869. The reversal of 5209218823 is 3288129025.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5209218823 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5209210823) 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, 23658 + ... + 104776.

It is an arithmetic number, because the mean of its divisors is an integer number (1302341040).

Almost surely, 2^5209218823 is an apocalyptic number.

5209218823 is a deficient number, since it is larger than the sum of its proper divisors (145337).

5209218823 is an equidigital number, since it uses as much as digits as its factorization.

5209218823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145336.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 5209218823 is about 72174.9182403416. The cubic root of 5209218823 is about 1733.5014145890.

The spelling of 5209218823 in words is "five billion, two hundred nine million, two hundred eighteen thousand, eight hundred twenty-three".