505537681 has 4 divisors (see below), whose sum is σ = 551495664. Its totient is φ = 459579700.

The previous prime is 505537663. The next prime is 505537709. The reversal of 505537681 is 186735505.

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.

It is a cyclic number.

It is not a de Polignac number, because 505537681 - 2⁹ = 505537169 is a prime.

It is a super-2 number, since 2×505537681² = 511136693821715522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505537621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22978975 + ... + 22978996.

It is an arithmetic number, because the mean of its divisors is an integer number (137873916).

Almost surely, 2^505537681 is an apocalyptic number.

It is an amenable number.

505537681 is a deficient number, since it is larger than the sum of its proper divisors (45957983).

505537681 is a wasteful number, since it uses less digits than its factorization.

505537681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45957982.

The product of its (nonzero) digits is 126000, while the sum is 40.

The square root of 505537681 is about 22484.1651168105. The cubic root of 505537681 is about 796.6199480276.

The spelling of 505537681 in words is "five hundred five million, five hundred thirty-seven thousand, six hundred eighty-one".