509731779382 has 16 divisors (see below), whose sum is σ = 877074337440. Its totient is φ = 217644369408.

The previous prime is 509731779377. The next prime is 509731779383. The reversal of 509731779382 is 283977137905.

It is a self number, because there is not a number n which added to its sum of digits gives 509731779382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509731779383) 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, 67671723 + ... + 67679254.

It is an arithmetic number, because the mean of its divisors is an integer number (54817146090).

Almost surely, 2^509731779382 is an apocalyptic number.

509731779382 is a deficient number, since it is larger than the sum of its proper divisors (367342558058).

509731779382 is a wasteful number, since it uses less digits than its factorization.

509731779382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135351255.

The product of its (nonzero) digits is 20003760, while the sum is 61.

The spelling of 509731779382 in words is "five hundred nine billion, seven hundred thirty-one million, seven hundred seventy-nine thousand, three hundred eighty-two".