81431143922 has 6 divisors (see below), whose sum is σ = 122147321229. Its totient is φ = 40715370180.

The previous prime is 81431143907. The next prime is 81431144023. The reversal of 81431143922 is 22934113418.

It can be written as a sum of positive squares in 2 ways, for example, as 62420525281 + 19010618641 = 249841^2 + 137879^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=201781.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 302672 + ... + 504452.

Almost surely, 2^81431143922 is an apocalyptic number.

81431143922 is a deficient number, since it is larger than the sum of its proper divisors (40716177307).

81431143922 is an frugal number, since it uses more digits than its factorization.

81431143922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403564 (or 201783 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The spelling of 81431143922 in words is "eighty-one billion, four hundred thirty-one million, one hundred forty-three thousand, nine hundred twenty-two".