505217939 has 2 divisors, whose sum is σ = 505217940. Its totient is φ = 505217938.

The previous prime is 505217893. The next prime is 505217953. The reversal of 505217939 is 939712505.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505217939 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 505217896 and 505217905.

It is not a weakly prime, because it can be changed into another prime (505217959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252608969 + 252608970.

It is an arithmetic number, because the mean of its divisors is an integer number (252608970).

Almost surely, 2^505217939 is an apocalyptic number.

505217939 is a deficient number, since it is larger than the sum of its proper divisors (1).

505217939 is an equidigital number, since it uses as much as digits as its factorization.

505217939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 85050, while the sum is 41.

The square root of 505217939 is about 22477.0536102933. The cubic root of 505217939 is about 796.4519641271.

The spelling of 505217939 in words is "five hundred five million, two hundred seventeen thousand, nine hundred thirty-nine".