503405121 has 8 divisors (see below), whose sum is σ = 674088480. Its totient is φ = 334162592.

The previous prime is 503405083. The next prime is 503405129. The reversal of 503405121 is 121504305.

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 503405121 - 2¹⁷ = 503274049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (503405129) 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 7 ways as a sum of consecutive naturals, for example, 359391 + ... + 360788.

It is an arithmetic number, because the mean of its divisors is an integer number (84261060).

Almost surely, 2^503405121 is an apocalyptic number.

It is an amenable number.

503405121 is a deficient number, since it is larger than the sum of its proper divisors (170683359).

503405121 is a wasteful number, since it uses less digits than its factorization.

503405121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720415.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 503405121 is about 22436.6914004717. The cubic root of 503405121 is about 795.4982154582.

Adding to 503405121 its reverse (121504305), we get a palindrome (624909426).

The spelling of 503405121 in words is "five hundred three million, four hundred five thousand, one hundred twenty-one".