81465 has 8 divisors (see below), whose sum is σ = 130368. Its totient is φ = 43440.

The previous prime is 81463. The next prime is 81509. The reversal of 81465 is 56418.

81465 = T₈₆ + T₈₇ + ... + T₁₀₃.

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

It is not a de Polignac number, because 81465 - 2¹ = 81463 is a prime.

81465 is a lucky number.

It is a plaindrome in base 9.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81465.

It is not an unprimeable number, because it can be changed into a prime (81463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2701 + ... + 2730.

It is an arithmetic number, because the mean of its divisors is an integer number (16296).

2⁸¹⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

81465 is a deficient number, since it is larger than the sum of its proper divisors (48903).

81465 is a wasteful number, since it uses less digits than its factorization.

81465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439.

The product of its digits is 960, while the sum is 24.

The square root of 81465 is about 285.4207420634. The cubic root of 81465 is about 43.3501249848.

The spelling of 81465 in words is "eighty-one thousand, four hundred sixty-five".