81068671 has 4 divisors (see below), whose sum is σ = 81090792. Its totient is φ = 81046552.

The previous prime is 81068653. The next prime is 81068683. The reversal of 81068671 is 17686018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81068671 - 2⁵ = 81068639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81068671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81068621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4105 + ... + 13378.

It is an arithmetic number, because the mean of its divisors is an integer number (20272698).

Almost surely, 2^81068671 is an apocalyptic number.

81068671 is a deficient number, since it is larger than the sum of its proper divisors (22121).

81068671 is a wasteful number, since it uses less digits than its factorization.

81068671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22120.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 81068671 is about 9003.8142473065. The cubic root of 81068671 is about 432.7971090488.

The spelling of 81068671 in words is "eighty-one million, sixty-eight thousand, six hundred seventy-one".