6481997 has 2 divisors, whose sum is σ = 6481998. Its totient is φ = 6481996.

The previous prime is 6481991. The next prime is 6481999. The reversal of 6481997 is 7991846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5851561 + 630436 = 2419^2 + 794^2 .

It is a cyclic number.

It is not a de Polignac number, because 6481997 - 2¹⁸ = 6219853 is a prime.

Together with 6481999, 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 (6481991) 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, 3240998 + 3240999.

It is an arithmetic number, because the mean of its divisors is an integer number (3240999).

Almost surely, 2^6481997 is an apocalyptic number.

It is an amenable number.

6481997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6481997 is an equidigital number, since it uses as much as digits as its factorization.

6481997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 6481997 is about 2545.9766299006. The cubic root of 6481997 is about 186.4531000671.

It can be divided in two parts, 6 and 481997, that multiplied together give a palindrome (2891982).

The spelling of 6481997 in words is "six million, four hundred eighty-one thousand, nine hundred ninety-seven".