81360881 has 8 divisors (see below), whose sum is σ = 93402624. Its totient is φ = 69423840.

The previous prime is 81360841. The next prime is 81360889. The reversal of 81360881 is 18806318.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81360881 - 2²² = 77166577 is a prime.

It is a super-2 number, since 2×81360881² = 13239185914192322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81360889) 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, 24500 + ... + 27621.

It is an arithmetic number, because the mean of its divisors is an integer number (11675328).

Almost surely, 2^81360881 is an apocalyptic number.

It is an amenable number.

81360881 is a deficient number, since it is larger than the sum of its proper divisors (12041743).

81360881 is a wasteful number, since it uses less digits than its factorization.

81360881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52351.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 81360881 is about 9020.0266629318. The cubic root of 81360881 is about 433.3164876423.

The spelling of 81360881 in words is "eighty-one million, three hundred sixty thousand, eight hundred eighty-one".