505165501 has 2 divisors, whose sum is σ = 505165502. Its totient is φ = 505165500.

The previous prime is 505165417. The next prime is 505165547. The reversal of 505165501 is 105561505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 410103001 + 95062500 = 20251^2 + 9750^2 .

It is a cyclic number.

It is not a de Polignac number, because 505165501 - 2⁷ = 505165373 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 505165501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505165561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252582750 + 252582751.

It is an arithmetic number, because the mean of its divisors is an integer number (252582751).

Almost surely, 2^505165501 is an apocalyptic number.

It is an amenable number.

505165501 is a deficient number, since it is larger than the sum of its proper divisors (1).

505165501 is an equidigital number, since it uses as much as digits as its factorization.

505165501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 505165501 is about 22475.8871015139. The cubic root of 505165501 is about 796.4244078391.

The spelling of 505165501 in words is "five hundred five million, one hundred sixty-five thousand, five hundred one".