509669819 has 2 divisors, whose sum is σ = 509669820. Its totient is φ = 509669818.

The previous prime is 509669777. The next prime is 509669827. The reversal of 509669819 is 918966905.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 509669819 - 2²⁸ = 241234363 is a prime.

It is a super-4 number, since 4×509669819⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (509669899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254834909 + 254834910.

It is an arithmetic number, because the mean of its divisors is an integer number (254834910).

Almost surely, 2^509669819 is an apocalyptic number.

509669819 is a deficient number, since it is larger than the sum of its proper divisors (1).

509669819 is an equidigital number, since it uses as much as digits as its factorization.

509669819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The square root of 509669819 is about 22575.8680674742. The cubic root of 509669819 is about 798.7845182529.

The spelling of 509669819 in words is "five hundred nine million, six hundred sixty-nine thousand, eight hundred nineteen".