155503 has 4 divisors (see below), whose sum is σ = 162288. Its totient is φ = 148720.

The previous prime is 155501. The next prime is 155509. The reversal of 155503 is 305551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155503 - 2¹ = 155501 is a prime.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3358 + ... + 3403.

It is an arithmetic number, because the mean of its divisors is an integer number (40572).

2¹⁵⁵⁵⁰³ is an apocalyptic number.

155503 is a deficient number, since it is larger than the sum of its proper divisors (6785).

155503 is an equidigital number, since it uses as much as digits as its factorization.

155503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6784.

The product of its (nonzero) digits is 375, while the sum is 19.

The square root of 155503 is about 394.3386869177. The cubic root of 155503 is about 53.7748974253.

The spelling of 155503 in words is "one hundred fifty-five thousand, five hundred three".