81852211 has 8 divisors (see below), whose sum is σ = 94106880. Its totient is φ = 69737928.

The previous prime is 81852167. The next prime is 81852223. The reversal of 81852211 is 11225818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81852211 - 2¹¹ = 81850163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81852211.

It is not an unprimeable number, because it can be changed into a prime (81852011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33841 + ... + 36178.

It is an arithmetic number, because the mean of its divisors is an integer number (11763360).

Almost surely, 2^81852211 is an apocalyptic number.

81852211 is a deficient number, since it is larger than the sum of its proper divisors (12254669).

81852211 is a wasteful number, since it uses less digits than its factorization.

81852211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70193.

The product of its digits is 1280, while the sum is 28.

The square root of 81852211 is about 9047.2211755876. The cubic root of 81852211 is about 434.1869889451.

The spelling of 81852211 in words is "eighty-one million, eight hundred fifty-two thousand, two hundred eleven".