509209206447 has 4 divisors (see below), whose sum is σ = 678945608600. Its totient is φ = 339472804296.

The previous prime is 509209206439. The next prime is 509209206487. The reversal of 509209206447 is 744602902905.

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

It is not a de Polignac number, because 509209206447 - 2³ = 509209206439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 509209206396 and 509209206405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509209206487) 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, 84868201072 + ... + 84868201077.

It is an arithmetic number, because the mean of its divisors is an integer number (169736402150).

Almost surely, 2^509209206447 is an apocalyptic number.

509209206447 is a deficient number, since it is larger than the sum of its proper divisors (169736402153).

509209206447 is a wasteful number, since it uses less digits than its factorization.

509209206447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169736402152.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 509209206447 in words is "five hundred nine billion, two hundred nine million, two hundred six thousand, four hundred forty-seven".