81534 has 16 divisors (see below), whose sum is σ = 165888. Its totient is φ = 26712.

The previous prime is 81533. The next prime is 81547. The reversal of 81534 is 43518.

It is a self number, because there is not a number n which added to its sum of digits gives 81534.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81534.

It is not an unprimeable number, because it can be changed into a prime (81533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 579 + ... + 705.

It is an arithmetic number, because the mean of its divisors is an integer number (10368).

2⁸¹⁵³⁴ is an apocalyptic number.

81534 is an abundant number, since it is smaller than the sum of its proper divisors (84354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82944).

81534 is a wasteful number, since it uses less digits than its factorization.

81534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239.

The product of its digits is 480, while the sum is 21.

The square root of 81534 is about 285.5415906659. The cubic root of 81534 is about 43.3623605647.

The spelling of 81534 in words is "eighty-one thousand, five hundred thirty-four".