506719909 has 4 divisors (see below), whose sum is σ = 516280716. Its totient is φ = 497159104.

The previous prime is 506719879. The next prime is 506719951. The reversal of 506719909 is 909917605.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 466992100 + 39727809 = 21610^2 + 6303^2 .

It is a cyclic number.

It is not a de Polignac number, because 506719909 - 2¹⁷ = 506588837 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 (506719999) 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, 4780324 + ... + 4780429.

It is an arithmetic number, because the mean of its divisors is an integer number (129070179).

Almost surely, 2^506719909 is an apocalyptic number.

It is an amenable number.

506719909 is a deficient number, since it is larger than the sum of its proper divisors (9560807).

506719909 is an equidigital number, since it uses as much as digits as its factorization.

506719909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9560806.

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 506719909 is about 22510.4400001422. The cubic root of 506719909 is about 797.2404446168.

It can be divided in two parts, 5067 and 19909, that added together give a triangular number (24976 = T₂₂₃).

The spelling of 506719909 in words is "five hundred six million, seven hundred nineteen thousand, nine hundred nine".