6543353891 has 2 divisors, whose sum is σ = 6543353892. Its totient is φ = 6543353890.

The previous prime is 6543353867. The next prime is 6543353909. The reversal of 6543353891 is 1983533456.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6543353891 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6543353801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271676945 + 3271676946.

It is an arithmetic number, because the mean of its divisors is an integer number (3271676946).

Almost surely, 2^6543353891 is an apocalyptic number.

6543353891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6543353891 is an equidigital number, since it uses as much as digits as its factorization.

6543353891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 47.

The square root of 6543353891 is about 80891.0000618116. Note that the first 4 decimals coincide. The cubic root of 6543353891 is about 1870.3955897149.

The spelling of 6543353891 in words is "six billion, five hundred forty-three million, three hundred fifty-three thousand, eight hundred ninety-one".