505000155 has 24 divisors (see below), whose sum is σ = 888135696. Its totient is φ = 244847680.

The previous prime is 505000141. The next prime is 505000159. The reversal of 505000155 is 551000505.

It is not a de Polignac number, because 505000155 - 2⁵ = 505000123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (505000159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137304 + ... + 140933.

It is an arithmetic number, because the mean of its divisors is an integer number (37005654).

Almost surely, 2^505000155 is an apocalyptic number.

505000155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

505000155 is a deficient number, since it is larger than the sum of its proper divisors (383135541).

505000155 is a wasteful number, since it uses less digits than its factorization.

505000155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278267 (or 278256 counting only the distinct ones).

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

The square root of 505000155 is about 22472.2085029487. The cubic root of 505000155 is about 796.3375056524.

The spelling of 505000155 in words is "five hundred five million, one hundred fifty-five", and thus it is an aban number.