81031104 has 420 divisors, whose sum is σ = 315330840. Its totient is φ = 20321280.

The previous prime is 81031099. The next prime is 81031141. The reversal of 81031104 is 40113018.

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

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2794162 + ... + 2794190.

Almost surely, 2^81031104 is an apocalyptic number.

81031104 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81031104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157665420).

81031104 is an abundant number, since it is smaller than the sum of its proper divisors (234299736).

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

81031104 is a wasteful number, since it uses less digits than its factorization.

81031104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 81031104 is about 9001.7278341438. The cubic root of 81031104 is about 432.7302463883.

The spelling of 81031104 in words is "eighty-one million, thirty-one thousand, one hundred four".