81114012 has 72 divisors (see below), whose sum is σ = 239148000. Its totient is φ = 23171904.

The previous prime is 81113993. The next prime is 81114013. The reversal of 81114012 is 21041118.

It is a super-2 number, since 2×81114012² = 13158965885472288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81114013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9064 + ... + 15632.

It is an arithmetic number, because the mean of its divisors is an integer number (3321500).

Almost surely, 2^81114012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81114012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119574000).

81114012 is an abundant number, since it is smaller than the sum of its proper divisors (158033988).

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

81114012 is a wasteful number, since it uses less digits than its factorization.

81114012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6600 (or 6581 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 81114012 is about 9006.3317727030. The cubic root of 81114012 is about 432.8777805594.

The spelling of 81114012 in words is "eighty-one million, one hundred fourteen thousand, twelve".