505435681 has 4 divisors (see below), whose sum is σ = 505970352. Its totient is φ = 504901012.

The previous prime is 505435673. The next prime is 505435757. The reversal of 505435681 is 186534505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186534505 = 5 ⋅37306901.

It is a cyclic number.

It is not a de Polignac number, because 505435681 - 2³ = 505435673 is a prime.

It is a super-2 number, since 2×505435681² = 510930455255867522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 505435681.

It is not an unprimeable number, because it can be changed into a prime (505435621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265915 + ... + 267808.

It is an arithmetic number, because the mean of its divisors is an integer number (126492588).

Almost surely, 2^505435681 is an apocalyptic number.

It is an amenable number.

505435681 is a deficient number, since it is larger than the sum of its proper divisors (534671).

505435681 is an equidigital number, since it uses as much as digits as its factorization.

505435681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534670.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 505435681 is about 22481.8967393768. The cubic root of 505435681 is about 796.5663676496.

The spelling of 505435681 in words is "five hundred five million, four hundred thirty-five thousand, six hundred eighty-one".