81735727 has 2 divisors, whose sum is σ = 81735728. Its totient is φ = 81735726.

The previous prime is 81735713. The next prime is 81735749. The reversal of 81735727 is 72753718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81735727 - 2¹¹ = 81733679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81735727.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81735757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40867863 + 40867864.

It is an arithmetic number, because the mean of its divisors is an integer number (40867864).

Almost surely, 2^81735727 is an apocalyptic number.

81735727 is a deficient number, since it is larger than the sum of its proper divisors (1).

81735727 is an equidigital number, since it uses as much as digits as its factorization.

81735727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82320, while the sum is 40.

The square root of 81735727 is about 9040.7813268544. The cubic root of 81735727 is about 433.9809271209.

Subtracting from 81735727 its reverse (72753718), we obtain a square (8982009 = 2997²).

The spelling of 81735727 in words is "eighty-one million, seven hundred thirty-five thousand, seven hundred twenty-seven".