81844131351 has 8 divisors (see below), whose sum is σ = 110184979840. Its totient is φ = 54033018552.

The previous prime is 81844131323. The next prime is 81844131409. The reversal of 81844131351 is 15313144818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81844131351 - 2¹¹ = 81844129303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81844131311) 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 7 ways as a sum of consecutive naturals, for example, 132433561 + ... + 132434178.

It is an arithmetic number, because the mean of its divisors is an integer number (13773122480).

Almost surely, 2^81844131351 is an apocalyptic number.

81844131351 is a deficient number, since it is larger than the sum of its proper divisors (28340848489).

81844131351 is a wasteful number, since it uses less digits than its factorization.

81844131351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264867845.

The product of its digits is 46080, while the sum is 39.

The spelling of 81844131351 in words is "eighty-one billion, eight hundred forty-four million, one hundred thirty-one thousand, three hundred fifty-one".