81812269441 has 8 divisors (see below), whose sum is σ = 93685624704. Its totient is φ = 69985386240.

The previous prime is 81812269397. The next prime is 81812269457. The reversal of 81812269441 is 14496221818.

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

It is not a de Polignac number, because 81812269441 - 2³³ = 73222334849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81812269391 and 81812269400.

It is not an unprimeable number, because it can be changed into a prime (81812269481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11614240 + ... + 11621281.

It is an arithmetic number, because the mean of its divisors is an integer number (11710703088).

Almost surely, 2^81812269441 is an apocalyptic number.

It is an amenable number.

81812269441 is a deficient number, since it is larger than the sum of its proper divisors (11873355263).

81812269441 is a wasteful number, since it uses less digits than its factorization.

81812269441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23236031.

The product of its digits is 221184, while the sum is 46.

The spelling of 81812269441 in words is "eighty-one billion, eight hundred twelve million, two hundred sixty-nine thousand, four hundred forty-one".