6421593947 has 2 divisors, whose sum is σ = 6421593948. Its totient is φ = 6421593946.

The previous prime is 6421593911. The next prime is 6421594009. The reversal of 6421593947 is 7493951246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6421593947 - 2¹⁰ = 6421592923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6421593895 and 6421593904.

It is not a weakly prime, because it can be changed into another prime (6421593247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210796973 + 3210796974.

It is an arithmetic number, because the mean of its divisors is an integer number (3210796974).

Almost surely, 2^6421593947 is an apocalyptic number.

6421593947 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421593947 is an equidigital number, since it uses as much as digits as its factorization.

6421593947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The square root of 6421593947 is about 80134.8485179825. The cubic root of 6421593947 is about 1858.7213190013.

The spelling of 6421593947 in words is "six billion, four hundred twenty-one million, five hundred ninety-three thousand, nine hundred forty-seven".