81151 has 4 divisors (see below), whose sum is σ = 92752. Its totient is φ = 69552.

The previous prime is 81131. The next prime is 81157. The reversal of 81151 is 15118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15118 = 2 ⋅7559.

It is not a de Polignac number, because 81151 - 2⁵ = 81119 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5790 + ... + 5803.

It is an arithmetic number, because the mean of its divisors is an integer number (23188).

2⁸¹¹⁵¹ is an apocalyptic number.

81151 is a deficient number, since it is larger than the sum of its proper divisors (11601).

81151 is a wasteful number, since it uses less digits than its factorization.

81151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11600.

The product of its digits is 40, while the sum is 16.

The square root of 81151 is about 284.8701458560. The cubic root of 81151 is about 43.2943568002.

Adding to 81151 its reverse (15118), we get a palindrome (96269).

It can be divided in two parts, 81 and 151, that added together give a palindrome (232).

The spelling of 81151 in words is "eighty-one thousand, one hundred fifty-one".