81852227 has 4 divisors (see below), whose sum is σ = 81985080. Its totient is φ = 81719376.

The previous prime is 81852223. The next prime is 81852233. The reversal of 81852227 is 72225818.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81852227 - 2² = 81852223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81852223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65498 + ... + 66735.

It is an arithmetic number, because the mean of its divisors is an integer number (20496270).

Almost surely, 2^81852227 is an apocalyptic number.

81852227 is a deficient number, since it is larger than the sum of its proper divisors (132853).

81852227 is a wasteful number, since it uses less digits than its factorization.

81852227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132852.

The product of its digits is 17920, while the sum is 35.

The square root of 81852227 is about 9047.2220598369. Note that the first 3 decimals coincide. The cubic root of 81852227 is about 434.1870172359.

The spelling of 81852227 in words is "eighty-one million, eight hundred fifty-two thousand, two hundred twenty-seven".