81818063 has 8 divisors (see below), whose sum is σ = 84144768. Its totient is φ = 79497504.

The previous prime is 81818003. The next prime is 81818069. The reversal of 81818063 is 36081818.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81818063 - 2⁶ = 81817999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81818069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43970 + ... + 45792.

It is an arithmetic number, because the mean of its divisors is an integer number (10518096).

Almost surely, 2^81818063 is an apocalyptic number.

81818063 is a deficient number, since it is larger than the sum of its proper divisors (2326705).

81818063 is a wasteful number, since it uses less digits than its factorization.

81818063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073.

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

The square root of 81818063 is about 9045.3337694084. Note that the first 3 decimals coincide. The cubic root of 81818063 is about 434.1266009220.

It can be divided in two parts, 818 and 18063, that added together give a palindrome (18881).

The spelling of 81818063 in words is "eighty-one million, eight hundred eighteen thousand, sixty-three".