81332112 has 40 divisors (see below), whose sum is σ = 210861504. Its totient is φ = 27013504.

The previous prime is 81332107. The next prime is 81332113. The reversal of 81332112 is 21123318.

It is a super-2 number, since 2×81332112² = 13229824884761088, which contains 22 as substring.

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 (81332113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11173 + ... + 16955.

Almost surely, 2^81332112 is an apocalyptic number.

It is an amenable number.

81332112 is an abundant number, since it is smaller than the sum of its proper divisors (129529392).

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

81332112 is a wasteful number, since it uses less digits than its factorization.

81332112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6087 (or 6081 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 81332112 is about 9018.4317927232. The cubic root of 81332112 is about 433.2654084197.

The spelling of 81332112 in words is "eighty-one million, three hundred thirty-two thousand, one hundred twelve".