81936711 has 8 divisors (see below), whose sum is σ = 121387760. Its totient is φ = 54624456.

The previous prime is 81936671. The next prime is 81936749. The reversal of 81936711 is 11763918.

It is not a de Polignac number, because 81936711 - 2¹¹ = 81934663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81936011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1517320 + ... + 1517373.

It is an arithmetic number, because the mean of its divisors is an integer number (15173470).

Almost surely, 2^81936711 is an apocalyptic number.

81936711 is a deficient number, since it is larger than the sum of its proper divisors (39451049).

81936711 is a wasteful number, since it uses less digits than its factorization.

81936711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3034702 (or 3034696 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 81936711 is about 9051.8899131618. The cubic root of 81936711 is about 434.3363483093.

The spelling of 81936711 in words is "eighty-one million, nine hundred thirty-six thousand, seven hundred eleven".