505677857 has 2 divisors, whose sum is σ = 505677858. Its totient is φ = 505677856.

The previous prime is 505677791. The next prime is 505677863. The reversal of 505677857 is 758776505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421111441 + 84566416 = 20521^2 + 9196^2 .

It is a cyclic number.

It is not a de Polignac number, because 505677857 - 2¹⁴ = 505661473 is a prime.

It is a super-2 number, since 2×505677857² = 511420190120224898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (505670857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252838928 + 252838929.

It is an arithmetic number, because the mean of its divisors is an integer number (252838929).

Almost surely, 2^505677857 is an apocalyptic number.

It is an amenable number.

505677857 is a deficient number, since it is larger than the sum of its proper divisors (1).

505677857 is an equidigital number, since it uses as much as digits as its factorization.

505677857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2058000, while the sum is 50.

The square root of 505677857 is about 22487.2821167877. The cubic root of 505677857 is about 796.6935704186.

The spelling of 505677857 in words is "five hundred five million, six hundred seventy-seven thousand, eight hundred fifty-seven".