81086274209 has 16 divisors (see below), whose sum is σ = 87558261120. Its totient is φ = 74861592960.

The previous prime is 81086274173. The next prime is 81086274211. The reversal of 81086274209 is 90247268018.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-81086274209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81086274239) 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 in 15 ways as a sum of consecutive naturals, for example, 2187389 + ... + 2224149.

It is an arithmetic number, because the mean of its divisors is an integer number (5472391320).

Almost surely, 2^81086274209 is an apocalyptic number.

It is an amenable number.

81086274209 is a deficient number, since it is larger than the sum of its proper divisors (6471986911).

81086274209 is a wasteful number, since it uses less digits than its factorization.

81086274209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40120.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 81086274209 in words is "eighty-one billion, eighty-six million, two hundred seventy-four thousand, two hundred nine".