81281242441 has 16 divisors (see below), whose sum is σ = 94589587456. Its totient is φ = 68408395776.

The previous prime is 81281242423. The next prime is 81281242447. The reversal of 81281242441 is 14424218218.

It is not a de Polignac number, because 81281242441 - 2⁵ = 81281242409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81281242441.

It is not an unprimeable number, because it can be changed into a prime (81281242447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385056 + ... + 557521.

It is an arithmetic number, because the mean of its divisors is an integer number (5911849216).

Almost surely, 2^81281242441 is an apocalyptic number.

It is an amenable number.

81281242441 is a deficient number, since it is larger than the sum of its proper divisors (13308345015).

81281242441 is a wasteful number, since it uses less digits than its factorization.

81281242441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942808.

The product of its digits is 32768, while the sum is 37.

The spelling of 81281242441 in words is "eighty-one billion, two hundred eighty-one million, two hundred forty-two thousand, four hundred forty-one".