81368771 has 8 divisors (see below), whose sum is σ = 90830784. Its totient is φ = 72250920.

The previous prime is 81368767. The next prime is 81368803. The reversal of 81368771 is 17786318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81368771 - 2² = 81368767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81368711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85541 + ... + 86486.

It is an arithmetic number, because the mean of its divisors is an integer number (11353848).

Almost surely, 2^81368771 is an apocalyptic number.

81368771 is a deficient number, since it is larger than the sum of its proper divisors (9462013).

81368771 is a wasteful number, since it uses less digits than its factorization.

81368771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172081.

The product of its digits is 56448, while the sum is 41.

The square root of 81368771 is about 9020.4640124552. The cubic root of 81368771 is about 433.3304941957.

The spelling of 81368771 in words is "eighty-one million, three hundred sixty-eight thousand, seven hundred seventy-one".