81500112 has 30 divisors (see below), whose sum is σ = 228087522. Its totient is φ = 27166656.

The previous prime is 81500077. The next prime is 81500117. The reversal of 81500112 is 21100518.

It can be written as a sum of positive squares in only one way, i.e., 79495056 + 2005056 = 8916^2 + 1416^2 .

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 (81500117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282843 + ... + 283130.

Almost surely, 2^81500112 is an apocalyptic number.

It is an amenable number.

81500112 is an abundant number, since it is smaller than the sum of its proper divisors (146587410).

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

81500112 is a wasteful number, since it uses less digits than its factorization.

81500112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565987 (or 565978 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 81500112 is about 9027.7412457381. The cubic root of 81500112 is about 433.5635216199.

The spelling of 81500112 in words is "eighty-one million, five hundred thousand, one hundred twelve".