209328613 has 4 divisors (see below), whose sum is σ = 225430828. Its totient is φ = 193226400.

The previous prime is 209328607. The next prime is 209328649. The reversal of 209328613 is 316823902.

It is a happy number.

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 36747844 + 172580769 = 6062^2 + 13137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209328613 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 (209328673) 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, 8051088 + ... + 8051113.

It is an arithmetic number, because the mean of its divisors is an integer number (56357707).

Almost surely, 2^209328613 is an apocalyptic number.

It is an amenable number.

209328613 is a deficient number, since it is larger than the sum of its proper divisors (16102215).

209328613 is a wasteful number, since it uses less digits than its factorization.

209328613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16102214.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 209328613 is about 14468.1931491116. The cubic root of 209328613 is about 593.7580790332.

The spelling of 209328613 in words is "two hundred nine million, three hundred twenty-eight thousand, six hundred thirteen".