505155 has 32 divisors (see below), whose sum is σ = 981504. Its totient is φ = 216576.

The previous prime is 505139. The next prime is 505157. The reversal of 505155 is 551505.

505155 = T₂₆ + T₂₇ + ... + T₁₄₄.

It is not a de Polignac number, because 505155 - 2⁴ = 505139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

505155 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (505157) 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 31 ways as a sum of consecutive naturals, for example, 1644 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (30672).

2⁵⁰⁵¹⁵⁵ is an apocalyptic number.

505155 is a deficient number, since it is larger than the sum of its proper divisors (476349).

505155 is a wasteful number, since it uses less digits than its factorization.

505155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315.

The product of its (nonzero) digits is 625, while the sum is 21.

The square root of 505155 is about 710.7425694300. The cubic root of 505155 is about 79.6418889311.

The spelling of 505155 in words is "five hundred five thousand, one hundred fifty-five".