505702409 has 2 divisors, whose sum is σ = 505702410. Its totient is φ = 505702408.

The previous prime is 505702391. The next prime is 505702441. The reversal of 505702409 is 904207505.

It is an a-pointer prime, because the next prime (505702441) can be obtained adding 505702409 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370678009 + 135024400 = 19253^2 + 11620^2 .

It is a cyclic number.

It is not a de Polignac number, because 505702409 - 2²⁴ = 488925193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (505752409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252851204 + 252851205.

It is an arithmetic number, because the mean of its divisors is an integer number (252851205).

Almost surely, 2^505702409 is an apocalyptic number.

It is an amenable number.

505702409 is a deficient number, since it is larger than the sum of its proper divisors (1).

505702409 is an equidigital number, since it uses as much as digits as its factorization.

505702409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 505702409 is about 22487.8280187305. The cubic root of 505702409 is about 796.7064640713.

The spelling of 505702409 in words is "five hundred five million, seven hundred two thousand, four hundred nine".