506249309 has 4 divisors (see below), whose sum is σ = 514548540. Its totient is φ = 497950080.

The previous prime is 506249257. The next prime is 506249321. The reversal of 506249309 is 903942605.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903942605 = 5 ⋅180788521.

It can be written as a sum of positive squares in 2 ways, for example, as 242674084 + 263575225 = 15578^2 + 16235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-506249309 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 (506249329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4149524 + ... + 4149645.

It is an arithmetic number, because the mean of its divisors is an integer number (128637135).

Almost surely, 2^506249309 is an apocalyptic number.

It is an amenable number.

506249309 is a deficient number, since it is larger than the sum of its proper divisors (8299231).

506249309 is an equidigital number, since it uses as much as digits as its factorization.

506249309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8299230.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 506249309 is about 22499.9846444392. The cubic root of 506249309 is about 796.9935642710.

The spelling of 506249309 in words is "five hundred six million, two hundred forty-nine thousand, three hundred nine".