5209210823 has 2 divisors, whose sum is σ = 5209210824. Its totient is φ = 5209210822.

The previous prime is 5209210819. The next prime is 5209210837. The reversal of 5209210823 is 3280129025.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5209210823 - 2² = 5209210819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5209210823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5209210813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2604605411 + 2604605412.

It is an arithmetic number, because the mean of its divisors is an integer number (2604605412).

Almost surely, 2^5209210823 is an apocalyptic number.

5209210823 is a deficient number, since it is larger than the sum of its proper divisors (1).

5209210823 is an equidigital number, since it uses as much as digits as its factorization.

5209210823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 5209210823 is about 72174.8628194055. The cubic root of 5209210823 is about 1733.5005271867.

Adding to 5209210823 its reverse (3280129025), we get a palindrome (8489339848).

The spelling of 5209210823 in words is "five billion, two hundred nine million, two hundred ten thousand, eight hundred twenty-three".