6398551 has 2 divisors, whose sum is σ = 6398552. Its totient is φ = 6398550.

The previous prime is 6398543. The next prime is 6398563. The reversal of 6398551 is 1558936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6398551 - 2³ = 6398543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6398551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6390551) 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, 3199275 + 3199276.

It is an arithmetic number, because the mean of its divisors is an integer number (3199276).

Almost surely, 2^6398551 is an apocalyptic number.

6398551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6398551 is an equidigital number, since it uses as much as digits as its factorization.

6398551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

The square root of 6398551 is about 2529.5357281525. The cubic root of 6398551 is about 185.6495404906.

The spelling of 6398551 in words is "six million, three hundred ninety-eight thousand, five hundred fifty-one".