6497581 has 2 divisors, whose sum is σ = 6497582. Its totient is φ = 6497580.

The previous prime is 6497539. The next prime is 6497591. The reversal of 6497581 is 1857946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6295081 + 202500 = 2509^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 6497581 - 2⁷ = 6497453 is a prime.

It is a super-2 number, since 2×6497581² = 84437117703122, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6497591) 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, 3248790 + 3248791.

It is an arithmetic number, because the mean of its divisors is an integer number (3248791).

Almost surely, 2^6497581 is an apocalyptic number.

It is an amenable number.

6497581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6497581 is an equidigital number, since it uses as much as digits as its factorization.

6497581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 6497581 is about 2549.0353077194. The cubic root of 6497581 is about 186.6024038286.

It can be divided in two parts, 64975 and 81, that added together give a palindrome (65056).

The spelling of 6497581 in words is "six million, four hundred ninety-seven thousand, five hundred eighty-one".