6556397 has 2 divisors, whose sum is σ = 6556398. Its totient is φ = 6556396.

The previous prime is 6556393. The next prime is 6556399. The reversal of 6556397 is 7936556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5597956 + 958441 = 2366^2 + 979^2 .

It is a cyclic number.

It is not a de Polignac number, because 6556397 - 2² = 6556393 is a prime.

Together with 6556399, 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 (6556393) 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, 3278198 + 3278199.

It is an arithmetic number, because the mean of its divisors is an integer number (3278199).

Almost surely, 2^6556397 is an apocalyptic number.

It is an amenable number.

6556397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6556397 is an equidigital number, since it uses as much as digits as its factorization.

6556397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 170100, while the sum is 41.

The square root of 6556397 is about 2560.5462307875. The cubic root of 6556397 is about 187.1637541076.

The spelling of 6556397 in words is "six million, five hundred fifty-six thousand, three hundred ninety-seven".