509731520079 has 8 divisors (see below), whose sum is σ = 715412659840. Its totient is φ = 321935696856.

The previous prime is 509731520009. The next prime is 509731520083. The reversal of 509731520079 is 970025137905.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-509731520079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509731520009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4471329067 + ... + 4471329180.

It is an arithmetic number, because the mean of its divisors is an integer number (89426582480).

Almost surely, 2^509731520079 is an apocalyptic number.

509731520079 is a deficient number, since it is larger than the sum of its proper divisors (205681139761).

509731520079 is a wasteful number, since it uses less digits than its factorization.

509731520079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8942658269.

The product of its (nonzero) digits is 595350, while the sum is 48.

The spelling of 509731520079 in words is "five hundred nine billion, seven hundred thirty-one million, five hundred twenty thousand, seventy-nine".