81208222 has 4 divisors (see below), whose sum is σ = 121812336. Its totient is φ = 40604110.

The previous prime is 81208217. The next prime is 81208247. The reversal of 81208222 is 22280218.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20302054 + ... + 20302057.

It is an arithmetic number, because the mean of its divisors is an integer number (30453084).

Almost surely, 2^81208222 is an apocalyptic number.

81208222 is a deficient number, since it is larger than the sum of its proper divisors (40604114).

81208222 is a wasteful number, since it uses less digits than its factorization.

81208222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40604113.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 81208222 is about 9011.5604642037. The cubic root of 81208222 is about 433.0453045845.

The spelling of 81208222 in words is "eighty-one million, two hundred eight thousand, two hundred twenty-two".