81068279 has 4 divisors (see below), whose sum is σ = 82793184. Its totient is φ = 79343376.

The previous prime is 81068263. The next prime is 81068321. The reversal of 81068279 is 97286018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97286018 = 2 ⋅48643009.

It is a cyclic number.

It is not a de Polignac number, because 81068279 - 2⁴ = 81068263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81068249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 862382 + ... + 862475.

It is an arithmetic number, because the mean of its divisors is an integer number (20698296).

Almost surely, 2^81068279 is an apocalyptic number.

81068279 is a deficient number, since it is larger than the sum of its proper divisors (1724905).

81068279 is a wasteful number, since it uses less digits than its factorization.

81068279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724904.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 81068279 is about 9003.7924787281. The cubic root of 81068279 is about 432.7964114643.

The spelling of 81068279 in words is "eighty-one million, sixty-eight thousand, two hundred seventy-nine".