81000318 has 32 divisors (see below), whose sum is σ = 185872896. Its totient is φ = 23051808.

The previous prime is 81000299. The next prime is 81000323. The reversal of 81000318 is 81300018.

It is a happy number.

It is a super-2 number, since 2×81000318² = 13122103032202248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 81000294 and 81000303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7380 + ... + 14712.

It is an arithmetic number, because the mean of its divisors is an integer number (5808528).

Almost surely, 2^81000318 is an apocalyptic number.

81000318 is an abundant number, since it is smaller than the sum of its proper divisors (104872578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81000318 is a wasteful number, since it uses less digits than its factorization.

81000318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7608.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 81000318 is about 9000.0176666493. The cubic root of 81000318 is about 432.6754373080.

It can be divided in two parts, 81000 and 318, that added together give a palindrome (81318).

The spelling of 81000318 in words is "eighty-one million, three hundred eighteen", and thus it is an aban number.