81686114 has 8 divisors (see below), whose sum is σ = 122921580. Its totient is φ = 40712256.

The previous prime is 81686089. The next prime is 81686123. The reversal of 81686114 is 41168618.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 71656225 + 10029889 = 8465^2 + 3167^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64619 + ... + 65870.

Almost surely, 2^81686114 is an apocalyptic number.

81686114 is a deficient number, since it is larger than the sum of its proper divisors (41235466).

81686114 is a wasteful number, since it uses less digits than its factorization.

81686114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130804.

The product of its digits is 9216, while the sum is 35.

The square root of 81686114 is about 9038.0370656465. The cubic root of 81686114 is about 433.8931015788.

The spelling of 81686114 in words is "eighty-one million, six hundred eighty-six thousand, one hundred fourteen".