81229622 has 4 divisors (see below), whose sum is σ = 121844436. Its totient is φ = 40614810.

The previous prime is 81229597. The next prime is 81229627. The reversal of 81229622 is 22692218.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81229627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20307404 + ... + 20307407.

It is an arithmetic number, because the mean of its divisors is an integer number (30461109).

Almost surely, 2^81229622 is an apocalyptic number.

81229622 is a deficient number, since it is larger than the sum of its proper divisors (40614814).

81229622 is a wasteful number, since it uses less digits than its factorization.

81229622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40614813.

The product of its digits is 6912, while the sum is 32.

The square root of 81229622 is about 9012.7477497154. The cubic root of 81229622 is about 433.0833399598.

The spelling of 81229622 in words is "eighty-one million, two hundred twenty-nine thousand, six hundred twenty-two".