81126216 has 48 divisors (see below), whose sum is σ = 220484160. Its totient is φ = 26947680.

The previous prime is 81126211. The next prime is 81126217. The reversal of 81126216 is 61262118.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81126216.

It is not an unprimeable number, because it can be changed into a prime (81126211) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 20581 + ... + 24203.

It is an arithmetic number, because the mean of its divisors is an integer number (4593420).

Almost surely, 2^81126216 is an apocalyptic number.

It is an amenable number.

81126216 is an abundant number, since it is smaller than the sum of its proper divisors (139357944).

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

81126216 is a wasteful number, since it uses less digits than its factorization.

81126216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946 (or 3939 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 81126216 is about 9007.0092705626. The cubic root of 81126216 is about 432.8994889974.

The spelling of 81126216 in words is "eighty-one million, one hundred twenty-six thousand, two hundred sixteen".