6471389081 has 2 divisors, whose sum is σ = 6471389082. Its totient is φ = 6471389080.

The previous prime is 6471389053. The next prime is 6471389137. The reversal of 6471389081 is 1809831746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5882890000 + 588499081 = 76700^2 + 24259^2 .

It is a cyclic number.

It is not a de Polignac number, because 6471389081 - 2¹⁰ = 6471388057 is a prime.

It is a super-2 number, since 2×6471389081² = 83757753275372049122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6471389011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3235694540 + 3235694541.

It is an arithmetic number, because the mean of its divisors is an integer number (3235694541).

Almost surely, 2^6471389081 is an apocalyptic number.

It is an amenable number.

6471389081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6471389081 is an equidigital number, since it uses as much as digits as its factorization.

6471389081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 6471389081 is about 80444.9444092045. The cubic root of 6471389081 is about 1863.5133311104.

The spelling of 6471389081 in words is "six billion, four hundred seventy-one million, three hundred eighty-nine thousand, eighty-one".