505019309 has 4 divisors (see below), whose sum is σ = 505211616. Its totient is φ = 504827004.

The previous prime is 505019269. The next prime is 505019341. The reversal of 505019309 is 903910505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505019309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505019399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92159 + ... + 97484.

It is an arithmetic number, because the mean of its divisors is an integer number (126302904).

Almost surely, 2^505019309 is an apocalyptic number.

It is an amenable number.

505019309 is a deficient number, since it is larger than the sum of its proper divisors (192307).

505019309 is a wasteful number, since it uses less digits than its factorization.

505019309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192306.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 505019309 is about 22472.6346697489. The cubic root of 505019309 is about 796.3475735409.

The spelling of 505019309 in words is "five hundred five million, nineteen thousand, three hundred nine".