509432779 has 4 divisors (see below), whose sum is σ = 509652184. Its totient is φ = 509213376.

The previous prime is 509432711. The next prime is 509432783. The reversal of 509432779 is 977234905.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 509432779 - 2²³ = 501044171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509433779) 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, 106182 + ... + 110875.

It is an arithmetic number, because the mean of its divisors is an integer number (127413046).

Almost surely, 2^509432779 is an apocalyptic number.

509432779 is a deficient number, since it is larger than the sum of its proper divisors (219405).

509432779 is a wasteful number, since it uses less digits than its factorization.

509432779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219404.

The product of its (nonzero) digits is 476280, while the sum is 46.

The square root of 509432779 is about 22570.6176034241. The cubic root of 509432779 is about 798.6606647067.

It can be divided in two parts, 5094 and 32779, that added together give a palindrome (37873).

The spelling of 509432779 in words is "five hundred nine million, four hundred thirty-two thousand, seven hundred seventy-nine".