81322 has 8 divisors (see below), whose sum is σ = 123876. Its totient is φ = 40032.

The previous prime is 81307. The next prime is 81331. The reversal of 81322 is 22318.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77841 + 3481 = 279^2 + 59^2 .

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

It is a super-2 number, since 2×81322² = 13226535368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81296 and 81305.

It is a congruent number.

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, 133 + ... + 424.

2⁸¹³²² is an apocalyptic number.

81322 is a deficient number, since it is larger than the sum of its proper divisors (42554).

81322 is a wasteful number, since it uses less digits than its factorization.

81322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632.

The product of its digits is 96, while the sum is 16.

The square root of 81322 is about 285.1701246625. The cubic root of 81322 is about 43.3247451751.

Adding to 81322 its product of digits (96), we get a palindrome (81418).

The spelling of 81322 in words is "eighty-one thousand, three hundred twenty-two".