81086207 has 2 divisors, whose sum is σ = 81086208. Its totient is φ = 81086206.

The previous prime is 81086197. The next prime is 81086219. The reversal of 81086207 is 70268018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81086207 - 2¹⁰ = 81085183 is a prime.

It is equal to p_4729244 and since 81086207 and 4729244 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81286207) 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, 40543103 + 40543104.

It is an arithmetic number, because the mean of its divisors is an integer number (40543104).

Almost surely, 2^81086207 is an apocalyptic number.

81086207 is a deficient number, since it is larger than the sum of its proper divisors (1).

81086207 is an equidigital number, since it uses as much as digits as its factorization.

81086207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 81086207 is about 9004.7880041676. The cubic root of 81086207 is about 432.8283129769.

The spelling of 81086207 in words is "eighty-one million, eighty-six thousand, two hundred seven".