7806443081 has 2 divisors, whose sum is σ = 7806443082. Its totient is φ = 7806443080.

The previous prime is 7806443077. The next prime is 7806443093. The reversal of 7806443081 is 1803446087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5014905856 + 2791537225 = 70816^2 + 52835^2 .

It is an emirp because it is prime and its reverse (1803446087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7806443081 - 2² = 7806443077 is a prime.

It is a super-2 number, since 2×7806443081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7806443011) 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, 3903221540 + 3903221541.

It is an arithmetic number, because the mean of its divisors is an integer number (3903221541).

Almost surely, 2^7806443081 is an apocalyptic number.

It is an amenable number.

7806443081 is a deficient number, since it is larger than the sum of its proper divisors (1).

7806443081 is an equidigital number, since it uses as much as digits as its factorization.

7806443081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 7806443081 is about 88354.0778968351. The cubic root of 7806443081 is about 1983.7383952060.

The spelling of 7806443081 in words is "seven billion, eight hundred six million, four hundred forty-three thousand, eighty-one".