81927711 has 6 divisors (see below), whose sum is σ = 118340040. Its totient is φ = 54618468.

The previous prime is 81927707. The next prime is 81927739. The reversal of 81927711 is 11772918.

It is not a de Polignac number, because 81927711 - 2² = 81927707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81927701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4551531 + ... + 4551548.

It is an arithmetic number, because the mean of its divisors is an integer number (19723340).

Almost surely, 2^81927711 is an apocalyptic number.

81927711 is a deficient number, since it is larger than the sum of its proper divisors (36412329).

81927711 is a wasteful number, since it uses less digits than its factorization.

81927711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9103085 (or 9103082 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 81927711 is about 9051.3927657571. The cubic root of 81927711 is about 434.3204450989.

The spelling of 81927711 in words is "eighty-one million, nine hundred twenty-seven thousand, seven hundred eleven".