509683491899 has 4 divisors (see below), whose sum is σ = 517290708264. Its totient is φ = 502076275536.

The previous prime is 509683491893. The next prime is 509683491923. The reversal of 509683491899 is 998194386905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998194386905 = 5 ⋅199638877381.

It is a cyclic number.

It is not a de Polignac number, because 509683491899 - 2⁸ = 509683491643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509683491893) 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, 3803608082 + ... + 3803608215.

It is an arithmetic number, because the mean of its divisors is an integer number (129322677066).

Almost surely, 2^509683491899 is an apocalyptic number.

509683491899 is a deficient number, since it is larger than the sum of its proper divisors (7607216365).

509683491899 is an equidigital number, since it uses as much as digits as its factorization.

509683491899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7607216364.

The product of its (nonzero) digits is 151165440, while the sum is 71.

The spelling of 509683491899 in words is "five hundred nine billion, six hundred eighty-three million, four hundred ninety-one thousand, eight hundred ninety-nine".