6971812809 has 32 divisors (see below), whose sum is σ = 10139001600. Its totient is φ = 4235666688.

The previous prime is 6971812789. The next prime is 6971812811. The reversal of 6971812809 is 9082181796.

It is not a de Polignac number, because 6971812809 - 2⁷ = 6971812681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6971812849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1399447 + ... + 1404419.

It is an arithmetic number, because the mean of its divisors is an integer number (316843800).

Almost surely, 2^6971812809 is an apocalyptic number.

It is an amenable number.

6971812809 is a deficient number, since it is larger than the sum of its proper divisors (3167188791).

6971812809 is a wasteful number, since it uses less digits than its factorization.

6971812809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5441.

The product of its (nonzero) digits is 435456, while the sum is 51.

The square root of 6971812809 is about 83497.3820487804. The cubic root of 6971812809 is about 1910.3601021467.

The spelling of 6971812809 in words is "six billion, nine hundred seventy-one million, eight hundred twelve thousand, eight hundred nine".