81012 has 24 divisors (see below), whose sum is σ = 194656. Its totient is φ = 26208.

The previous prime is 81001. The next prime is 81013. The reversal of 81012 is 21018.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81013) 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, 438 + ... + 594.

2⁸¹⁰¹² is an apocalyptic number.

It is an amenable number.

81012 is an abundant number, since it is smaller than the sum of its proper divisors (113644).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97328).

81012 is a wasteful number, since it uses less digits than its factorization.

81012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 81012 is about 284.6260704855. The cubic root of 81012 is about 43.2696236697.

The spelling of 81012 in words is "eighty-one thousand, twelve".