81065207 has 2 divisors, whose sum is σ = 81065208. Its totient is φ = 81065206.

The previous prime is 81065203. The next prime is 81065213. The reversal of 81065207 is 70256018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81065207 - 2² = 81065203 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81065207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81065203) 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, 40532603 + 40532604.

It is an arithmetic number, because the mean of its divisors is an integer number (40532604).

Almost surely, 2^81065207 is an apocalyptic number.

81065207 is a deficient number, since it is larger than the sum of its proper divisors (1).

81065207 is an equidigital number, since it uses as much as digits as its factorization.

81065207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 81065207 is about 9003.6218823316. The cubic root of 81065207 is about 432.7909446020.

The spelling of 81065207 in words is "eighty-one million, sixty-five thousand, two hundred seven".