85541 has 4 divisors (see below), whose sum is σ = 86412. Its totient is φ = 84672.

The previous prime is 85531. The next prime is 85549. The reversal of 85541 is 14558.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 21025 + 64516 = 145^2 + 254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85541 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266 + ... + 491.

It is an arithmetic number, because the mean of its divisors is an integer number (21603).

2⁸⁵⁵⁴¹ is an apocalyptic number.

It is an amenable number.

85541 is a deficient number, since it is larger than the sum of its proper divisors (871).

85541 is a wasteful number, since it uses less digits than its factorization.

85541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870.

The product of its digits is 800, while the sum is 23.

The square root of 85541 is about 292.4739304622. The cubic root of 85541 is about 44.0613812737.

It can be divided in two parts, 85 and 541, that added together give a palindrome (626).

The spelling of 85541 in words is "eighty-five thousand, five hundred forty-one".