6479999 has 2 divisors, whose sum is σ = 6480000. Its totient is φ = 6479998.

The previous prime is 6479989. The next prime is 6480011. The reversal of 6479999 is 9999746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6479999 - 2⁸ = 6479743 is a prime.

6479999 is a modest number, since divided by 9999 gives 647 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 6479999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6479929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3239999 + 3240000.

It is an arithmetic number, because the mean of its divisors is an integer number (3240000).

Almost surely, 2^6479999 is an apocalyptic number.

6479999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6479999 is an equidigital number, since it uses as much as digits as its factorization.

6479999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 53.

The square root of 6479999 is about 2545.5842158530. The cubic root of 6479999 is about 186.4339407670.

The spelling of 6479999 in words is "six million, four hundred seventy-nine thousand, nine hundred ninety-nine".