209173130 has 8 divisors (see below), whose sum is σ = 376511652. Its totient is φ = 83669248.

The previous prime is 209173127. The next prime is 209173163. The reversal of 209173130 is 31371902.

It can be written as a sum of positive squares in 2 ways, for example, as 179372449 + 29800681 = 13393^2 + 5459^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 209173130.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10458647 + ... + 10458666.

Almost surely, 2^209173130 is an apocalyptic number.

209173130 is a deficient number, since it is larger than the sum of its proper divisors (167338522).

209173130 is a wasteful number, since it uses less digits than its factorization.

209173130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20917320.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 209173130 is about 14462.8188815321. The cubic root of 209173130 is about 593.6110340707.

The spelling of 209173130 in words is "two hundred nine million, one hundred seventy-three thousand, one hundred thirty".