81065371 has 8 divisors (see below), whose sum is σ = 82082000. Its totient is φ = 80053920.

The previous prime is 81065357. The next prime is 81065389. The reversal of 81065371 is 17356018.

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 81065371 - 2²³ = 72676763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81065321) 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, 36976 + ... + 39106.

It is an arithmetic number, because the mean of its divisors is an integer number (10260250).

Almost surely, 2^81065371 is an apocalyptic number.

81065371 is a deficient number, since it is larger than the sum of its proper divisors (1016629).

81065371 is a wasteful number, since it uses less digits than its factorization.

81065371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 81065371 is about 9003.6309897730. The cubic root of 81065371 is about 432.7912364562.

The spelling of 81065371 in words is "eighty-one million, sixty-five thousand, three hundred seventy-one".