81351 has 16 divisors (see below), whose sum is σ = 126720. Its totient is φ = 51480.

The previous prime is 81349. The next prime is 81353. The reversal of 81351 is 15318.

It is a happy number.

81351 is nontrivially palindromic in base 12.

It is an interprime number because it is at equal distance from previous prime (81349) and next prime (81353).

It is not a de Polignac number, because 81351 - 2¹ = 81349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556 + ... + 686.

It is an arithmetic number, because the mean of its divisors is an integer number (7920).

2⁸¹³⁵¹ is an apocalyptic number.

81351 is a deficient number, since it is larger than the sum of its proper divisors (45369).

81351 is a wasteful number, since it uses less digits than its factorization.

81351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 157 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 81351 is about 285.2209669712. The cubic root of 81351 is about 43.3298945332.

Adding to 81351 its reverse (15318), we get a palindrome (96669).

The spelling of 81351 in words is "eighty-one thousand, three hundred fifty-one".