505870087 has 2 divisors, whose sum is σ = 505870088. Its totient is φ = 505870086.

The previous prime is 505870081. The next prime is 505870091. The reversal of 505870087 is 780078505.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505870087 is a prime.

It is a super-4 number, since 4×505870087⁴ (a number of 36 digits) contains 4444 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505870081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252935043 + 252935044.

It is an arithmetic number, because the mean of its divisors is an integer number (252935044).

Almost surely, 2^505870087 is an apocalyptic number.

505870087 is a deficient number, since it is larger than the sum of its proper divisors (1).

505870087 is an equidigital number, since it uses as much as digits as its factorization.

505870087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78400, while the sum is 40.

The square root of 505870087 is about 22491.5559043833. Note that the first 3 decimals coincide. The cubic root of 505870087 is about 796.7945101776.

The spelling of 505870087 in words is "five hundred five million, eight hundred seventy thousand, eighty-seven".