503423561 has 2 divisors, whose sum is σ = 503423562. Its totient is φ = 503423560.

The previous prime is 503423513. The next prime is 503423593. The reversal of 503423561 is 165324305.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495329536 + 8094025 = 22256^2 + 2845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-503423561 is a prime.

It is equal to p_26526422 and since 503423561 and 26526422 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (503423161) 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 as a sum of consecutive naturals, namely, 251711780 + 251711781.

It is an arithmetic number, because the mean of its divisors is an integer number (251711781).

Almost surely, 2^503423561 is an apocalyptic number.

It is an amenable number.

503423561 is a deficient number, since it is larger than the sum of its proper divisors (1).

503423561 is an equidigital number, since it uses as much as digits as its factorization.

503423561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 503423561 is about 22437.1023307378. The cubic root of 503423561 is about 795.5079285152.

Adding to 503423561 its reverse (165324305), we get a palindrome (668747866).

The spelling of 503423561 in words is "five hundred three million, four hundred twenty-three thousand, five hundred sixty-one".