81150 has 24 divisors (see below), whose sum is σ = 201624. Its totient is φ = 21600.

The previous prime is 81131. The next prime is 81157. The reversal of 81150 is 5118.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121 + ... + 420.

It is an arithmetic number, because the mean of its divisors is an integer number (8401).

2⁸¹¹⁵⁰ is an apocalyptic number.

81150 is an abundant number, since it is smaller than the sum of its proper divisors (120474).

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 (100812).

81150 is a wasteful number, since it uses less digits than its factorization.

81150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 551 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 81150 is about 284.8683906649. The cubic root of 81150 is about 43.2941789649.

Adding to 81150 its reverse (5118), we get a palindrome (86268).

It can be divided in two parts, 811 and 50, that added together give a triangular number (861 = T₄₁).

The spelling of 81150 in words is "eighty-one thousand, one hundred fifty".