505135661 has 2 divisors, whose sum is σ = 505135662. Its totient is φ = 505135660.

The previous prime is 505135613. The next prime is 505135667. The reversal of 505135661 is 166531505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405015625 + 100120036 = 20125^2 + 10006^2 .

It is a cyclic number.

It is not a de Polignac number, because 505135661 - 2⁶ = 505135597 is a prime.

It is a Chen prime.

It is equal to p_26611736 and since 505135661 and 26611736 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505135667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252567830 + 252567831.

It is an arithmetic number, because the mean of its divisors is an integer number (252567831).

Almost surely, 2^505135661 is an apocalyptic number.

It is an amenable number.

505135661 is a deficient number, since it is larger than the sum of its proper divisors (1).

505135661 is an equidigital number, since it uses as much as digits as its factorization.

505135661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 505135661 is about 22475.2232691913. The cubic root of 505135661 is about 796.4087260000.

The spelling of 505135661 in words is "five hundred five million, one hundred thirty-five thousand, six hundred sixty-one".