6815147947 has 2 divisors, whose sum is σ = 6815147948. Its totient is φ = 6815147946.

The previous prime is 6815147903. The next prime is 6815147971. The reversal of 6815147947 is 7497415186.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6815147947 - 2⁷ = 6815147819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6815147894 and 6815147903.

It is not a weakly prime, because it can be changed into another prime (6815147147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3407573973 + 3407573974.

It is an arithmetic number, because the mean of its divisors is an integer number (3407573974).

Almost surely, 2^6815147947 is an apocalyptic number.

6815147947 is a deficient number, since it is larger than the sum of its proper divisors (1).

6815147947 is an equidigital number, since it uses as much as digits as its factorization.

6815147947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 52.

The square root of 6815147947 is about 82553.9093380804. The cubic root of 6815147947 is about 1895.9422123418.

The spelling of 6815147947 in words is "six billion, eight hundred fifteen million, one hundred forty-seven thousand, nine hundred forty-seven".