503403613121 has 4 divisors (see below), whose sum is σ = 510917099952. Its totient is φ = 495890126292.

The previous prime is 503403613073. The next prime is 503403613123. The reversal of 503403613121 is 121316304305.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 503403613121 - 2²² = 503399418817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (503403613123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3756743315 + ... + 3756743448.

It is an arithmetic number, because the mean of its divisors is an integer number (127729274988).

Almost surely, 2^503403613121 is an apocalyptic number.

It is an amenable number.

503403613121 is a deficient number, since it is larger than the sum of its proper divisors (7513486831).

503403613121 is an equidigital number, since it uses as much as digits as its factorization.

503403613121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7513486830.

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 503403613121 its reverse (121316304305), we get a palindrome (624719917426).

The spelling of 503403613121 in words is "five hundred three billion, four hundred three million, six hundred thirteen thousand, one hundred twenty-one".