81065359 has 4 divisors (see below), whose sum is σ = 81087016. Its totient is φ = 81043704.

The previous prime is 81065357. The next prime is 81065389. The reversal of 81065359 is 95356018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95356018 = 2 ⋅47678009.

It is a cyclic number.

It is not a de Polignac number, because 81065359 - 2¹ = 81065357 is a prime.

It is a deceptive number, since it divides R_81065358.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81065357) 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, 3609 + ... + 13234.

It is an arithmetic number, because the mean of its divisors is an integer number (20271754).

Almost surely, 2^81065359 is an apocalyptic number.

81065359 is the 4813-rd nonagonal number.

81065359 is a deficient number, since it is larger than the sum of its proper divisors (21657).

81065359 is a wasteful number, since it uses less digits than its factorization.

81065359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21656.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 81065359 is about 9003.6303233751. The cubic root of 81065359 is about 432.7912151010.

The spelling of 81065359 in words is "eighty-one million, sixty-five thousand, three hundred fifty-nine".