6541999 has 2 divisors, whose sum is σ = 6542000. Its totient is φ = 6541998.

The previous prime is 6541993. The next prime is 6542021. The reversal of 6541999 is 9991456.

6541999 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6541999 - 2⁹ = 6541487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6541993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270999 + 3271000.

It is an arithmetic number, because the mean of its divisors is an integer number (3271000).

Almost surely, 2^6541999 is an apocalyptic number.

6541999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6541999 is an equidigital number, since it uses as much as digits as its factorization.

6541999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 43.

The square root of 6541999 is about 2557.7331760760. The cubic root of 6541999 is about 187.0266483799.

The spelling of 6541999 in words is "six million, five hundred forty-one thousand, nine hundred ninety-nine".