6731567081 has 2 divisors, whose sum is σ = 6731567082. Its totient is φ = 6731567080.

The previous prime is 6731567071. The next prime is 6731567093. The reversal of 6731567081 is 1807651376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3461557225 + 3270009856 = 58835^2 + 57184^2 .

It is a cyclic number.

It is not a de Polignac number, because 6731567081 - 2¹⁰ = 6731566057 is a prime.

It is a super-2 number, since 2×6731567081² = 90627990732005721122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6731567071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3365783540 + 3365783541.

It is an arithmetic number, because the mean of its divisors is an integer number (3365783541).

Almost surely, 2^6731567081 is an apocalyptic number.

6731567081 is the 43856-th centered heptagonal number.

It is an amenable number.

6731567081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6731567081 is an equidigital number, since it uses as much as digits as its factorization.

6731567081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 6731567081 is about 82046.1277635941. The cubic root of 6731567081 is about 1888.1597085560.

The spelling of 6731567081 in words is "six billion, seven hundred thirty-one million, five hundred sixty-seven thousand, eighty-one".