81316 has 12 divisors (see below), whose sum is σ = 147420. Its totient is φ = 39200.

The previous prime is 81307. The next prime is 81331. The reversal of 81316 is 61318.

It can be written as a sum of positive squares in 2 ways, for example, as 57600 + 23716 = 240^2 + 154^2 .

It is a super-2 number, since 2×81316² = 13224583712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81293 and 81302.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235 + ... + 466.

It is an arithmetic number, because the mean of its divisors is an integer number (12285).

2⁸¹³¹⁶ is an apocalyptic number.

It is an amenable number.

81316 is a deficient number, since it is larger than the sum of its proper divisors (66104).

81316 is a wasteful number, since it uses less digits than its factorization.

81316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734 (or 732 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 81316 is about 285.1596044323. The cubic root of 81316 is about 43.3236796378.

The spelling of 81316 in words is "eighty-one thousand, three hundred sixteen".