503417921 has 2 divisors, whose sum is σ = 503417922. Its totient is φ = 503417920.

The previous prime is 503417891. The next prime is 503417927. The reversal of 503417921 is 129714305.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 450288400 + 53129521 = 21220^2 + 7289^2 .

It is a cyclic number.

It is not a de Polignac number, because 503417921 - 2¹⁰ = 503416897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (503417927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251708960 + 251708961.

It is an arithmetic number, because the mean of its divisors is an integer number (251708961).

Almost surely, 2^503417921 is an apocalyptic number.

It is an amenable number.

503417921 is a deficient number, since it is larger than the sum of its proper divisors (1).

503417921 is an equidigital number, since it uses as much as digits as its factorization.

503417921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 503417921 is about 22436.9766457070. The cubic root of 503417921 is about 795.5049577355.

The spelling of 503417921 in words is "five hundred three million, four hundred seventeen thousand, nine hundred twenty-one".