81282112 has 14 divisors (see below), whose sum is σ = 161294318. Its totient is φ = 40641024.

The previous prime is 81282109. The next prime is 81282119. The reversal of 81282112 is 21128218.

It can be written as a sum of positive squares in only one way, i.e., 79138816 + 2143296 = 8896^2 + 1464^2 .

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (81282119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634953 + ... + 635080.

Almost surely, 2^81282112 is an apocalyptic number.

It is an amenable number.

81282112 is a deficient number, since it is larger than the sum of its proper divisors (80012206).

81282112 is a wasteful number, since it uses less digits than its factorization.

81282112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270045 (or 1270035 counting only the distinct ones).

The product of its digits is 512, while the sum is 25.

The square root of 81282112 is about 9015.6592659661. The cubic root of 81282112 is about 433.1766049912.

The spelling of 81282112 in words is "eighty-one million, two hundred eighty-two thousand, one hundred twelve".