209373121 has 4 divisors (see below), whose sum is σ = 215031892. Its totient is φ = 203714352.

The previous prime is 209373119. The next prime is 209373137. The reversal of 209373121 is 121373902.

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 100400400 + 108972721 = 10020^2 + 10439^2 .

It is a cyclic number.

It is not a de Polignac number, because 209373121 - 2¹ = 209373119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209373121.

It is not an unprimeable number, because it can be changed into a prime (209373181) 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, 2829330 + ... + 2829403.

It is an arithmetic number, because the mean of its divisors is an integer number (53757973).

Almost surely, 2^209373121 is an apocalyptic number.

It is an amenable number.

209373121 is a deficient number, since it is larger than the sum of its proper divisors (5658771).

209373121 is an equidigital number, since it uses as much as digits as its factorization.

209373121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5658770.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 209373121 is about 14469.7311999912. The cubic root of 209373121 is about 593.8001581856.

The spelling of 209373121 in words is "two hundred nine million, three hundred seventy-three thousand, one hundred twenty-one".