505211983 has 2 divisors, whose sum is σ = 505211984. Its totient is φ = 505211982.

The previous prime is 505211981. The next prime is 505212007. The reversal of 505211983 is 389112505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505211983 - 2¹ = 505211981 is a prime.

Together with 505211981, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505211981) 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, 252605991 + 252605992.

It is an arithmetic number, because the mean of its divisors is an integer number (252605992).

Almost surely, 2^505211983 is an apocalyptic number.

505211983 is a deficient number, since it is larger than the sum of its proper divisors (1).

505211983 is an equidigital number, since it uses as much as digits as its factorization.

505211983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 505211983 is about 22476.9211192281. The cubic root of 505211983 is about 796.4488343316.

The spelling of 505211983 in words is "five hundred five million, two hundred eleven thousand, nine hundred eighty-three".