81301222 has 4 divisors (see below), whose sum is σ = 121951836. Its totient is φ = 40650610.

The previous prime is 81301219. The next prime is 81301243. The reversal of 81301222 is 22210318.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81301222.

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, 20325304 + ... + 20325307.

It is an arithmetic number, because the mean of its divisors is an integer number (30487959).

Almost surely, 2^81301222 is an apocalyptic number.

81301222 is a deficient number, since it is larger than the sum of its proper divisors (40650614).

81301222 is a wasteful number, since it uses less digits than its factorization.

81301222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40650613.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 81301222 is about 9016.7190263421. The cubic root of 81301222 is about 433.2105499600.

The spelling of 81301222 in words is "eighty-one million, three hundred one thousand, two hundred twenty-two".