6209912809 has 3 divisors (see below), whose sum is σ = 6209991613. Its totient is φ = 6209834006.

The previous prime is 6209912771. The next prime is 6209912833. The reversal of 6209912809 is 9082199026.

The square root of 6209912809 is 78803.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 6209912809 - 2¹¹ = 6209910761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6209918809) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 39402 + ... + 118204.

Almost surely, 2^6209912809 is an apocalyptic number.

6209912809 is the 78803-rd square number.

6209912809 is the 39402-nd centered octagonal number.

It is an amenable number.

6209912809 is a deficient number, since it is larger than the sum of its proper divisors (78804).

6209912809 is an frugal number, since it uses more digits than its factorization.

6209912809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157606 (or 78803 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The cubic root of 6209912809 is about 1838.0691000681.

The spelling of 6209912809 in words is "six billion, two hundred nine million, nine hundred twelve thousand, eight hundred nine".