505612109 has 2 divisors, whose sum is σ = 505612110. Its totient is φ = 505612108.

The previous prime is 505612061. The next prime is 505612111. The reversal of 505612109 is 901216505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499746025 + 5866084 = 22355^2 + 2422^2 .

It is a cyclic number.

It is not a de Polignac number, because 505612109 - 2¹² = 505608013 is a prime.

It is a Sophie Germain prime.

Together with 505612111, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505615109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252806054 + 252806055.

It is an arithmetic number, because the mean of its divisors is an integer number (252806055).

Almost surely, 2^505612109 is an apocalyptic number.

It is an amenable number.

505612109 is a deficient number, since it is larger than the sum of its proper divisors (1).

505612109 is an equidigital number, since it uses as much as digits as its factorization.

505612109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 505612109 is about 22485.8201762800. The cubic root of 505612109 is about 796.6590403461.

The spelling of 505612109 in words is "five hundred five million, six hundred twelve thousand, one hundred nine".