5209918804819 has 2 divisors, whose sum is σ = 5209918804820. Its totient is φ = 5209918804818.

The previous prime is 5209918804781. The next prime is 5209918804841. The reversal of 5209918804819 is 9184088199025.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5209918804819 - 2¹⁷ = 5209918673747 is a prime.

It is a super-2 number, since 2×5209918804819² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5209918804219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2604959402409 + 2604959402410.

It is an arithmetic number, because the mean of its divisors is an integer number (2604959402410).

Almost surely, 2^{5209918804819} is an apocalyptic number.

5209918804819 is a deficient number, since it is larger than the sum of its proper divisors (1).

5209918804819 is an equidigital number, since it uses as much as digits as its factorization.

5209918804819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14929920, while the sum is 64.

The spelling of 5209918804819 in words is "five trillion, two hundred nine billion, nine hundred eighteen million, eight hundred four thousand, eight hundred nineteen".