81412216 has 16 divisors (see below), whose sum is σ = 154364400. Its totient is φ = 40248384.

The previous prime is 81412211. The next prime is 81412217. The reversal of 81412216 is 61221418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81412211) 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 3 ways as a sum of consecutive naturals, for example, 56460 + ... + 57883.

It is an arithmetic number, because the mean of its divisors is an integer number (9647775).

Almost surely, 2^81412216 is an apocalyptic number.

It is an amenable number.

81412216 is a deficient number, since it is larger than the sum of its proper divisors (72952184).

81412216 is a wasteful number, since it uses less digits than its factorization.

81412216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114438 (or 114434 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 81412216 is about 9022.8718266414. The cubic root of 81412216 is about 433.4076027863.

The spelling of 81412216 in words is "eighty-one million, four hundred twelve thousand, two hundred sixteen".