81852226 has 8 divisors (see below), whose sum is σ = 123015564. Its totient is φ = 40847040.

The previous prime is 81852223. The next prime is 81852233. The reversal of 81852226 is 62225818.

It can be written as a sum of positive squares in 2 ways, for example, as 72846225 + 9006001 = 8535^2 + 3001^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 81852191 and 81852200.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38235 + ... + 40318.

Almost surely, 2^81852226 is an apocalyptic number.

81852226 is a deficient number, since it is larger than the sum of its proper divisors (41163338).

81852226 is a wasteful number, since it uses less digits than its factorization.

81852226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79076.

The product of its digits is 15360, while the sum is 34.

The square root of 81852226 is about 9047.2220045713. Note that the first 3 decimals coincide. The cubic root of 81852226 is about 434.1870154677.

The spelling of 81852226 in words is "eighty-one million, eight hundred fifty-two thousand, two hundred twenty-six".