505430501 has 2 divisors, whose sum is σ = 505430502. Its totient is φ = 505430500.

The previous prime is 505430491. The next prime is 505430537. The reversal of 505430501 is 105034505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486158401 + 19272100 = 22049^2 + 4390^2 .

It is a cyclic number.

It is not a de Polignac number, because 505430501 - 2⁶ = 505430437 is a prime.

It is a super-2 number, since 2×505430501² = 510919982682222002, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505430551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252715250 + 252715251.

It is an arithmetic number, because the mean of its divisors is an integer number (252715251).

Almost surely, 2^505430501 is an apocalyptic number.

It is an amenable number.

505430501 is a deficient number, since it is larger than the sum of its proper divisors (1).

505430501 is an equidigital number, since it uses as much as digits as its factorization.

505430501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 505430501 is about 22481.7815352787. The cubic root of 505430501 is about 796.5636464146.

The spelling of 505430501 in words is "five hundred five million, four hundred thirty thousand, five hundred one".