505421550 has 144 divisors (see below), whose sum is σ = 1448478720. Its totient is φ = 126054720.

The previous prime is 505421537. The next prime is 505421569. The reversal of 505421550 is 55124505.

505421550 is a `hidden beast` number, since 505 + 4 + 2 + 155 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 485931 + ... + 486969.

It is an arithmetic number, because the mean of its divisors is an integer number (10058880).

Almost surely, 2^505421550 is an apocalyptic number.

505421550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 505421550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (724239360).

505421550 is an abundant number, since it is smaller than the sum of its proper divisors (943057170).

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

505421550 is a wasteful number, since it uses less digits than its factorization.

505421550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 505421550 is about 22481.5824620955. The cubic root of 505421550 is about 796.5589440976.

The spelling of 505421550 in words is "five hundred five million, four hundred twenty-one thousand, five hundred fifty".