6391289 has 2 divisors, whose sum is σ = 6391290. Its totient is φ = 6391288.

The previous prime is 6391267. The next prime is 6391321. The reversal of 6391289 is 9821936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5107600 + 1283689 = 2260^2 + 1133^2 .

It is a cyclic number.

It is not a de Polignac number, because 6391289 - 2¹² = 6387193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6391589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195644 + 3195645.

It is an arithmetic number, because the mean of its divisors is an integer number (3195645).

Almost surely, 2^6391289 is an apocalyptic number.

It is an amenable number.

6391289 is a deficient number, since it is larger than the sum of its proper divisors (1).

6391289 is an equidigital number, since it uses as much as digits as its factorization.

6391289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 6391289 is about 2528.0998793560. The cubic root of 6391289 is about 185.5792799309.

The spelling of 6391289 in words is "six million, three hundred ninety-one thousand, two hundred eighty-nine".