155005 has 8 divisors (see below), whose sum is σ = 192600. Its totient is φ = 119616.

The previous prime is 155003. The next prime is 155009. The reversal of 155005 is 500551.

It can be written as a sum of positive squares in 4 ways, for example, as 15129 + 139876 = 123^2 + 374^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155005 - 2¹ = 155003 is a prime.

155005 is a lucky number.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 155005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390 + ... + 679.

It is an arithmetic number, because the mean of its divisors is an integer number (24075).

2¹⁵⁵⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

155005 is a deficient number, since it is larger than the sum of its proper divisors (37595).

155005 is a wasteful number, since it uses less digits than its factorization.

155005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103.

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

The square root of 155005 is about 393.7067436557. The cubic root of 155005 is about 53.7174311438.

Adding to 155005 its reverse (500551), we get a palindrome (655556).

The spelling of 155005 in words is "one hundred fifty-five thousand, five".