81007727 has 2 divisors, whose sum is σ = 81007728. Its totient is φ = 81007726.

The previous prime is 81007699. The next prime is 81007739. The reversal of 81007727 is 72770018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81007727 - 2²⁰ = 79959151 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81007693 and 81007702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81007777) 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, 40503863 + 40503864.

It is an arithmetic number, because the mean of its divisors is an integer number (40503864).

Almost surely, 2^81007727 is an apocalyptic number.

81007727 is a deficient number, since it is larger than the sum of its proper divisors (1).

81007727 is an equidigital number, since it uses as much as digits as its factorization.

81007727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5488, while the sum is 32.

The square root of 81007727 is about 9000.4292675405. The cubic root of 81007727 is about 432.6886290034.

The spelling of 81007727 in words is "eighty-one million, seven thousand, seven hundred twenty-seven".