505303921 has 2 divisors, whose sum is σ = 505303922. Its totient is φ = 505303920.

The previous prime is 505303901. The next prime is 505303949. The reversal of 505303921 is 129303505.

It is an a-pointer prime, because the next prime (505303949) can be obtained adding 505303921 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490179600 + 15124321 = 22140^2 + 3889^2 .

It is a cyclic number.

It is not a de Polignac number, because 505303921 - 2¹³ = 505295729 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505303921.

It is not a weakly prime, because it can be changed into another prime (505303901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252651960 + 252651961.

It is an arithmetic number, because the mean of its divisors is an integer number (252651961).

Almost surely, 2^505303921 is an apocalyptic number.

It is an amenable number.

505303921 is a deficient number, since it is larger than the sum of its proper divisors (1).

505303921 is an equidigital number, since it uses as much as digits as its factorization.

505303921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 505303921 is about 22478.9661906414. The cubic root of 505303921 is about 796.4971437371.

The spelling of 505303921 in words is "five hundred five million, three hundred three thousand, nine hundred twenty-one".