81360865 has 8 divisors (see below), whose sum is σ = 97688448. Its totient is φ = 65051760.

The previous prime is 81360841. The next prime is 81360889. The reversal of 81360865 is 56806318.

It is an interprime number because it is at equal distance from previous prime (81360841) and next prime (81360889).

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

It is not a de Polignac number, because 81360865 - 2¹⁹ = 80836577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8424 + ... + 15286.

It is an arithmetic number, because the mean of its divisors is an integer number (12211056).

Almost surely, 2^81360865 is an apocalyptic number.

It is an amenable number.

81360865 is a deficient number, since it is larger than the sum of its proper divisors (16327583).

81360865 is a wasteful number, since it uses less digits than its factorization.

81360865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9239.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 81360865 is about 9020.0257760164. The cubic root of 81360865 is about 433.3164592377.

The spelling of 81360865 in words is "eighty-one million, three hundred sixty thousand, eight hundred sixty-five".