505788421 has 2 divisors, whose sum is σ = 505788422. Its totient is φ = 505788420.

The previous prime is 505788389. The next prime is 505788433. The reversal of 505788421 is 124887505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 488896321 + 16892100 = 22111^2 + 4110^2 .

It is a cyclic number.

It is not a de Polignac number, because 505788421 - 2⁵ = 505788389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505788121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252894210 + 252894211.

It is an arithmetic number, because the mean of its divisors is an integer number (252894211).

Almost surely, 2^505788421 is an apocalyptic number.

It is an amenable number.

505788421 is a deficient number, since it is larger than the sum of its proper divisors (1).

505788421 is an equidigital number, since it uses as much as digits as its factorization.

505788421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 89600, while the sum is 40.

The square root of 505788421 is about 22489.7403497684. The cubic root of 505788421 is about 796.7516305766.

The spelling of 505788421 in words is "five hundred five million, seven hundred eighty-eight thousand, four hundred twenty-one".