81526 has 4 divisors (see below), whose sum is σ = 122292. Its totient is φ = 40762.

The previous prime is 81517. The next prime is 81527. The reversal of 81526 is 62518.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62518 = 2 ⋅31259.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 81497 and 81506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81527) by changing a digit.

81526 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 20380 + ... + 20383.

It is an arithmetic number, because the mean of its divisors is an integer number (30573).

2⁸¹⁵²⁶ is an apocalyptic number.

81526 is a deficient number, since it is larger than the sum of its proper divisors (40766).

81526 is a wasteful number, since it uses less digits than its factorization.

81526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40765.

The product of its digits is 480, while the sum is 22.

The square root of 81526 is about 285.5275818551. The cubic root of 81526 is about 43.3609423006.

It can be divided in two parts, 815 and 26, that added together give a square (841 = 29²).

The spelling of 81526 in words is "eighty-one thousand, five hundred twenty-six".