155500 has 24 divisors (see below), whose sum is σ = 340704. Its totient is φ = 62000.

The previous prime is 155473. The next prime is 155501. The reversal of 155500 is 5551.

Added to its reverse (5551) it gives a 5-th power (161051 = 11⁵).

It is not an unprimeable number, because it can be changed into a prime (155501) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 345 + ... + 655.

It is an arithmetic number, because the mean of its divisors is an integer number (14196).

2¹⁵⁵⁵⁰⁰ is an apocalyptic number.

155500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170352).

155500 is an abundant number, since it is smaller than the sum of its proper divisors (185204).

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

155500 is a wasteful number, since it uses less digits than its factorization.

155500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 16.

The square root of 155500 is about 394.3348830626. The cubic root of 155500 is about 53.7745516105.

Adding to 155500 its reverse (5551), we get a 5-th power (161051 = 11⁵).

The spelling of 155500 in words is "one hundred fifty-five thousand, five hundred".