6559381 has 2 divisors, whose sum is σ = 6559382. Its totient is φ = 6559380.

The previous prime is 6559379. The next prime is 6559409. The reversal of 6559381 is 1839556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5904900 + 654481 = 2430^2 + 809^2 .

It is a cyclic number.

It is not a de Polignac number, because 6559381 - 2¹ = 6559379 is a prime.

It is a super-2 number, since 2×6559381² = 86050958206322, which contains 22 as substring.

Together with 6559379, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6559381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6559081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3279690 + 3279691.

It is an arithmetic number, because the mean of its divisors is an integer number (3279691).

Almost surely, 2^6559381 is an apocalyptic number.

It is an amenable number.

6559381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6559381 is an equidigital number, since it uses as much as digits as its factorization.

6559381 is an evil number, because the sum of its binary digits is even.

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

The square root of 6559381 is about 2561.1288526741. The cubic root of 6559381 is about 187.1921442907.

The spelling of 6559381 in words is "six million, five hundred fifty-nine thousand, three hundred eighty-one".