505142761 has 4 divisors (see below), whose sum is σ = 505191492. Its totient is φ = 505094032.

The previous prime is 505142753. The next prime is 505142779. The reversal of 505142761 is 167241505.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 167241505 = 5 ⋅33448301.

It can be written as a sum of positive squares in 2 ways, for example, as 211877136 + 293265625 = 14556^2 + 17125^2 .

It is a cyclic number.

It is not a de Polignac number, because 505142761 - 2³ = 505142753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505142791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1930 + ... + 31843.

It is an arithmetic number, because the mean of its divisors is an integer number (126297873).

Almost surely, 2^505142761 is an apocalyptic number.

It is an amenable number.

505142761 is a deficient number, since it is larger than the sum of its proper divisors (48731).

505142761 is a wasteful number, since it uses less digits than its factorization.

505142761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48730.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 505142761 is about 22475.3812203486. The cubic root of 505142761 is about 796.4124573247.

The spelling of 505142761 in words is "five hundred five million, one hundred forty-two thousand, seven hundred sixty-one".