6431993 has 2 divisors, whose sum is σ = 6431994. Its totient is φ = 6431992.

The previous prime is 6431987. The next prime is 6432011. The reversal of 6431993 is 3991346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6390784 + 41209 = 2528^2 + 203^2 .

It is a cyclic number.

It is not a de Polignac number, because 6431993 - 2⁴ = 6431977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6431963) 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, 3215996 + 3215997.

It is an arithmetic number, because the mean of its divisors is an integer number (3215997).

Almost surely, 2^6431993 is an apocalyptic number.

It is an amenable number.

6431993 is a deficient number, since it is larger than the sum of its proper divisors (1).

6431993 is an equidigital number, since it uses as much as digits as its factorization.

6431993 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 6431993 is about 2536.1374174126. The cubic root of 6431993 is about 185.9724108307.

The spelling of 6431993 in words is "six million, four hundred thirty-one thousand, nine hundred ninety-three".