6478891 has 2 divisors, whose sum is σ = 6478892. Its totient is φ = 6478890.

The previous prime is 6478883. The next prime is 6478931. The reversal of 6478891 is 1988746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6478891 - 2³ = 6478883 is a prime.

6478891 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6478831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3239445 + 3239446.

It is an arithmetic number, because the mean of its divisors is an integer number (3239446).

Almost surely, 2^6478891 is an apocalyptic number.

6478891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6478891 is an equidigital number, since it uses as much as digits as its factorization.

6478891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 6478891 is about 2545.3665747786. The cubic root of 6478891 is about 186.4233141923.

The spelling of 6478891 in words is "six million, four hundred seventy-eight thousand, eight hundred ninety-one".