81068081 has 4 divisors (see below), whose sum is σ = 81086832. Its totient is φ = 81049332.

The previous prime is 81068063. The next prime is 81068089. The reversal of 81068081 is 18086018.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18086018 = 2 ⋅9043009.

It is a cyclic number.

It is not a de Polignac number, because 81068081 - 2⁶ = 81068017 is a prime.

It is a super-2 number, since 2×81068081² = 13144067514045122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81068089) 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, 770 + ... + 12756.

It is an arithmetic number, because the mean of its divisors is an integer number (20271708).

Almost surely, 2^81068081 is an apocalyptic number.

It is an amenable number.

81068081 is a deficient number, since it is larger than the sum of its proper divisors (18751).

81068081 is a wasteful number, since it uses less digits than its factorization.

81068081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18750.

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 81068081 is about 9003.7814833546. The cubic root of 81068081 is about 432.7960591121.

The spelling of 81068081 in words is "eighty-one million, sixty-eight thousand, eighty-one".