509683491897 has 4 divisors (see below), whose sum is σ = 679577989200. Its totient is φ = 339788994596.

The previous prime is 509683491893. The next prime is 509683491923. The reversal of 509683491897 is 798194386905.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 509683491897 - 2² = 509683491893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (509683491893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84947248647 + ... + 84947248652.

It is an arithmetic number, because the mean of its divisors is an integer number (169894497300).

Almost surely, 2^509683491897 is an apocalyptic number.

It is an amenable number.

509683491897 is a deficient number, since it is larger than the sum of its proper divisors (169894497303).

509683491897 is a wasteful number, since it uses less digits than its factorization.

509683491897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169894497302.

The product of its (nonzero) digits is 117573120, while the sum is 69.

The spelling of 509683491897 in words is "five hundred nine billion, six hundred eighty-three million, four hundred ninety-one thousand, eight hundred ninety-seven".