6781534209 has 12 divisors (see below), whose sum is σ = 10371758436. Its totient is φ = 4255080192.

The previous prime is 6781534187. The next prime is 6781534211. The reversal of 6781534209 is 9024351876.

6781534209 is a `hidden beast` number, since 6 + 78 + 153 + 420 + 9 = 666.

6781534209 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5517518400 + 1264015809 = 74280^2 + 35553^2 .

It is not a de Polignac number, because 6781534209 - 2⁸ = 6781533953 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

6781534209 is strictly pandigital in base 10.

It is not an unprimeable number, because it can be changed into a prime (6781534229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22161724 + ... + 22162029.

It is an arithmetic number, because the mean of its divisors is an integer number (864313203).

It is a 1-persistent number, because it is pandigital, but 2⋅6781534209 = 13563068418 is not.

It is a Proth number, since it is equal to 51739 ⋅ 2¹⁷ + 1 and 51739 < 2¹⁷.

Almost surely, 2^6781534209 is an apocalyptic number.

It is an amenable number.

6781534209 is a deficient number, since it is larger than the sum of its proper divisors (3590224227).

6781534209 is a wasteful number, since it uses less digits than its factorization.

6781534209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44323776 (or 44323773 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 6781534209 is about 82350.0710928655. The cubic root of 6781534209 is about 1892.8200121383.

The spelling of 6781534209 in words is "six billion, seven hundred eighty-one million, five hundred thirty-four thousand, two hundred nine".