81206212 has 12 divisors (see below), whose sum is σ = 150470460. Its totient is φ = 38214656.

The previous prime is 81206201. The next prime is 81206227. The reversal of 81206212 is 21260218.

It can be written as a sum of positive squares in 2 ways, for example, as 25644096 + 55562116 = 5064^2 + 7454^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 597037 + ... + 597172.

It is an arithmetic number, because the mean of its divisors is an integer number (12539205).

Almost surely, 2^81206212 is an apocalyptic number.

It is an amenable number.

81206212 is a deficient number, since it is larger than the sum of its proper divisors (69264248).

81206212 is a wasteful number, since it uses less digits than its factorization.

81206212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194230 (or 1194228 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 81206212 is about 9011.4489400984. The cubic root of 81206212 is about 433.0417317597.

It can be divided in two parts, 81206 and 212, that added together give a palindrome (81418).

The spelling of 81206212 in words is "eighty-one million, two hundred six thousand, two hundred twelve".