6506389 has 2 divisors, whose sum is σ = 6506390. Its totient is φ = 6506388.

The previous prime is 6506387. The next prime is 6506399. The reversal of 6506389 is 9836056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4588164 + 1918225 = 2142^2 + 1385^2 .

It is a cyclic number.

It is not a de Polignac number, because 6506389 - 2¹ = 6506387 is a prime.

Together with 6506387, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6506387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3253194 + 3253195.

It is an arithmetic number, because the mean of its divisors is an integer number (3253195).

Almost surely, 2^6506389 is an apocalyptic number.

It is an amenable number.

6506389 is a deficient number, since it is larger than the sum of its proper divisors (1).

6506389 is an equidigital number, since it uses as much as digits as its factorization.

6506389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 6506389 is about 2550.7624350378. The cubic root of 6506389 is about 186.6866840070.

The spelling of 6506389 in words is "six million, five hundred six thousand, three hundred eighty-nine".