81952212 has 12 divisors (see below), whose sum is σ = 191221856. Its totient is φ = 27317400.

The previous prime is 81952207. The next prime is 81952271. The reversal of 81952212 is 21225918.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 81952212.

It is a congruent number.

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, 3414664 + ... + 3414687.

Almost surely, 2^81952212 is an apocalyptic number.

It is an amenable number.

81952212 is an abundant number, since it is smaller than the sum of its proper divisors (109269644).

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

81952212 is a wasteful number, since it uses less digits than its factorization.

81952212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6829358 (or 6829356 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 81952212 is about 9052.7461027028. The cubic root of 81952212 is about 434.3637362088.

The spelling of 81952212 in words is "eighty-one million, nine hundred fifty-two thousand, two hundred twelve".