209013453409 has 8 divisors (see below), whose sum is σ = 210101138280. Its totient is φ = 207926038656.

The previous prime is 209013453403. The next prime is 209013453431. The reversal of 209013453409 is 904354310902.

It can be written as a sum of positive squares in 4 ways, for example, as 87836362384 + 121177091025 = 296372^2 + 348105^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 209013453409 - 2³ = 209013453401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209013453401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1589397 + ... + 1715869.

It is an arithmetic number, because the mean of its divisors is an integer number (26262642285).

Almost surely, 2^209013453409 is an apocalyptic number.

It is an amenable number.

209013453409 is a deficient number, since it is larger than the sum of its proper divisors (1087684871).

209013453409 is a wasteful number, since it uses less digits than its factorization.

209013453409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135059.

The product of its (nonzero) digits is 116640, while the sum is 40.

The spelling of 209013453409 in words is "two hundred nine billion, thirteen million, four hundred fifty-three thousand, four hundred nine".