81385067 has 2 divisors, whose sum is σ = 81385068. Its totient is φ = 81385066.

The previous prime is 81384943. The next prime is 81385079. The reversal of 81385067 is 76058318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81385067 - 2⁸ = 81384811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81385067.

It is not a weakly prime, because it can be changed into another prime (81385097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40692533 + 40692534.

It is an arithmetic number, because the mean of its divisors is an integer number (40692534).

Almost surely, 2^81385067 is an apocalyptic number.

81385067 is a deficient number, since it is larger than the sum of its proper divisors (1).

81385067 is an equidigital number, since it uses as much as digits as its factorization.

81385067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 81385067 is about 9021.3672467093. The cubic root of 81385067 is about 433.3594204545.

The spelling of 81385067 in words is "eighty-one million, three hundred eighty-five thousand, sixty-seven".