81338827 has 2 divisors, whose sum is σ = 81338828. Its totient is φ = 81338826.

The previous prime is 81338821. The next prime is 81338837. The reversal of 81338827 is 72883318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81338827 - 2³ = 81338819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81338827.

It is not a weakly prime, because it can be changed into another prime (81338821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40669413 + 40669414.

It is an arithmetic number, because the mean of its divisors is an integer number (40669414).

Almost surely, 2^81338827 is an apocalyptic number.

81338827 is a deficient number, since it is larger than the sum of its proper divisors (1).

81338827 is an equidigital number, since it uses as much as digits as its factorization.

81338827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 40.

The square root of 81338827 is about 9018.8040781469. The cubic root of 81338827 is about 433.2773319478.

The spelling of 81338827 in words is "eighty-one million, three hundred thirty-eight thousand, eight hundred twenty-seven".