It is a happy number.
It is an Ulam number.
It is a congruent number.
155316 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2155316 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 155316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212016).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
155316 is a wasteful number, since it uses less digits than its factorization.
155316 is an evil number, because the sum of its binary digits is even.
The square root of 155316 is about 394.1015097662. The cubic root of 155316 is about 53.7533331266.
Multiplying 155316 by its sum of digits (21), we get a square (3261636 = 18062).
155316 divided by its sum of digits (21) gives a square (7396 = 862).
Adding to 155316 its reverse (613551), we get a palindrome (768867).
The spelling of 155316 in words is "one hundred fifty-five thousand, three hundred sixteen".