81080681 has 8 divisors (see below), whose sum is σ = 92297664. Its totient is φ = 70504720.

The previous prime is 81080677. The next prime is 81080689. The reversal of 81080681 is 18608018.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81080681 - 2² = 81080677 is a prime.

It is a super-2 number, since 2×81080681² = 13148153662847522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81080689) 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 7 ways as a sum of consecutive naturals, for example, 159986 + ... + 160491.

It is an arithmetic number, because the mean of its divisors is an integer number (11537208).

Almost surely, 2^81080681 is an apocalyptic number.

It is an amenable number.

81080681 is a deficient number, since it is larger than the sum of its proper divisors (11216983).

81080681 is a wasteful number, since it uses less digits than its factorization.

81080681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320511.

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

The square root of 81080681 is about 9004.4811621770. The cubic root of 81080681 is about 432.8184803815.

Adding to 81080681 its reverse (18608018), we get a palindrome (99688699).

The spelling of 81080681 in words is "eighty-one million, eighty thousand, six hundred eighty-one".