81360863 has 12 divisors (see below), whose sum is σ = 85288320. Its totient is φ = 77601216.

The previous prime is 81360841. The next prime is 81360889. The reversal of 81360863 is 36806318.

It is a happy number.

It is not a de Polignac number, because 81360863 - 2⁸ = 81360607 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 (81360893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74306 + ... + 75392.

It is an arithmetic number, because the mean of its divisors is an integer number (7107360).

Almost surely, 2^81360863 is an apocalyptic number.

81360863 is a deficient number, since it is larger than the sum of its proper divisors (3927457).

81360863 is a wasteful number, since it uses less digits than its factorization.

81360863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234 (or 1205 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 81360863 is about 9020.0256651520. The cubic root of 81360863 is about 433.3164556872.

The spelling of 81360863 in words is "eighty-one million, three hundred sixty thousand, eight hundred sixty-three".