505639873 has 2 divisors, whose sum is σ = 505639874. Its totient is φ = 505639872.

The previous prime is 505639811. The next prime is 505639877. The reversal of 505639873 is 378936505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 450627984 + 55011889 = 21228^2 + 7417^2 .

It is a cyclic number.

It is not a de Polignac number, because 505639873 - 2⁹ = 505639361 is a prime.

It is a super-3 number, since 3×505639873³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (505639877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252819936 + 252819937.

It is an arithmetic number, because the mean of its divisors is an integer number (252819937).

Almost surely, 2^505639873 is an apocalyptic number.

It is an amenable number.

505639873 is a deficient number, since it is larger than the sum of its proper divisors (1).

505639873 is an equidigital number, since it uses as much as digits as its factorization.

505639873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 46.

The square root of 505639873 is about 22486.4375346563. The cubic root of 505639873 is about 796.6736220358.

The spelling of 505639873 in words is "five hundred five million, six hundred thirty-nine thousand, eight hundred seventy-three".