81028081922 has 6 divisors (see below), whose sum is σ = 121542726729. Its totient is φ = 40513839680.

The previous prime is 81028081913. The next prime is 81028081931. The reversal of 81028081922 is 22918082018.

It is an interprime number because it is at equal distance from previous prime (81028081913) and next prime (81028081931).

It can be written as a sum of positive squares in 2 ways, for example, as 76463863441 + 4564218481 = 276521^2 + 67559^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=201281.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81028081922.

It is an unprimeable number.

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 in 2 ways as a sum of consecutive naturals, for example, 301922 + ... + 503202.

Almost surely, 2^81028081922 is an apocalyptic number.

81028081922 is a deficient number, since it is larger than the sum of its proper divisors (40514644807).

81028081922 is an frugal number, since it uses more digits than its factorization.

81028081922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402564 (or 201283 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 41.

The spelling of 81028081922 in words is "eighty-one billion, twenty-eight million, eighty-one thousand, nine hundred twenty-two".