81818306 has 8 divisors (see below), whose sum is σ = 122790924. Its totient is φ = 40888000.

The previous prime is 81818281. The next prime is 81818311. The reversal of 81818306 is 60381818.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 66569281 + 15249025 = 8159^2 + 3905^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5195 + ... + 13806.

Almost surely, 2^81818306 is an apocalyptic number.

81818306 is a deficient number, since it is larger than the sum of its proper divisors (40972618).

81818306 is a wasteful number, since it uses less digits than its factorization.

81818306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21156.

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

The square root of 81818306 is about 9045.3472017386. The cubic root of 81818306 is about 434.1270307075.

The spelling of 81818306 in words is "eighty-one million, eight hundred eighteen thousand, three hundred six".