6581963 has 2 divisors, whose sum is σ = 6581964. Its totient is φ = 6581962.

The previous prime is 6581959. The next prime is 6581969. The reversal of 6581963 is 3691856.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6581963 - 2² = 6581959 is a prime.

It is not a weakly prime, because it can be changed into another prime (6581969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3290981 + 3290982.

It is an arithmetic number, because the mean of its divisors is an integer number (3290982).

Almost surely, 2^6581963 is an apocalyptic number.

6581963 is a deficient number, since it is larger than the sum of its proper divisors (1).

6581963 is an equidigital number, since it uses as much as digits as its factorization.

6581963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 6581963 is about 2565.5336676801. The cubic root of 6581963 is about 187.4067138917.

It can be divided in two parts, 65 and 81963, that added together give a palindrome (82028).

The spelling of 6581963 in words is "six million, five hundred eighty-one thousand, nine hundred sixty-three".