6433991 has 2 divisors, whose sum is σ = 6433992. Its totient is φ = 6433990.

The previous prime is 6433981. The next prime is 6434011. The reversal of 6433991 is 1993346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6433991 - 2⁶ = 6433927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6433981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3216995 + 3216996.

It is an arithmetic number, because the mean of its divisors is an integer number (3216996).

Almost surely, 2^6433991 is an apocalyptic number.

6433991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6433991 is an equidigital number, since it uses as much as digits as its factorization.

6433991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 35.

The square root of 6433991 is about 2536.5312929274. The cubic root of 6433991 is about 185.9916653297.

The spelling of 6433991 in words is "six million, four hundred thirty-three thousand, nine hundred ninety-one".