8081681 has 8 divisors (see below), whose sum is σ = 8584704. Its totient is φ = 7581760.

The previous prime is 8081663. The next prime is 8081699. The reversal of 8081681 is 1861808.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8081663) and next prime (8081699).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8081681 is a prime.

It is a super-2 number, since 2×8081681² = 130627135571522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8081641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6776 + ... + 7878.

It is an arithmetic number, because the mean of its divisors is an integer number (1073088).

Almost surely, 2^8081681 is an apocalyptic number.

It is an amenable number.

8081681 is a deficient number, since it is larger than the sum of its proper divisors (503023).

8081681 is a wasteful number, since it uses less digits than its factorization.

8081681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551.

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

The square root of 8081681 is about 2842.8297522011. The cubic root of 8081681 is about 200.6783714593.

The spelling of 8081681 in words is "eight million, eighty-one thousand, six hundred eighty-one".