82881281 has 4 divisors (see below), whose sum is σ = 94721472. Its totient is φ = 71041092.

The previous prime is 82881269. The next prime is 82881299. The reversal of 82881281 is 18218828.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82881281 - 2¹⁰ = 82880257 is a prime.

It is a super-3 number, since 3×82881281³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82881251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5920085 + ... + 5920098.

It is an arithmetic number, because the mean of its divisors is an integer number (23680368).

Almost surely, 2^82881281 is an apocalyptic number.

It is an amenable number.

82881281 is a deficient number, since it is larger than the sum of its proper divisors (11840191).

82881281 is a wasteful number, since it uses less digits than its factorization.

82881281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11840190.

The product of its digits is 16384, while the sum is 38.

The square root of 82881281 is about 9103.9156960069. The cubic root of 82881281 is about 435.9989917352.

The spelling of 82881281 in words is "eighty-two million, eight hundred eighty-one thousand, two hundred eighty-one".