9937959917209 has 3 divisors (see below), whose sum is σ = 9937963069663. Its totient is φ = 9937956764756.

The previous prime is 9937959917201. The next prime is 9937959917213. The reversal of 9937959917209 is 9027199597399.

It is a happy number.

The square root of 9937959917209 is 3152453.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 5658142329225 + 4279817587984 = 2378685^2 + 2068772^2 .

It is not a de Polignac number, because 9937959917209 - 2³ = 9937959917201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9937959917201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1576227 + ... + 4728679.

Almost surely, 2^{9937959917209} is an apocalyptic number.

9937959917209 is the 3152453-rd square number.

9937959917209 is the 1576227-th centered octagonal number.

It is an amenable number.

9937959917209 is a deficient number, since it is larger than the sum of its proper divisors (3152454).

9937959917209 is an frugal number, since it uses more digits than its factorization.

9937959917209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6304906 (or 3152453 counting only the distinct ones).

The product of its (nonzero) digits is 781218270, while the sum is 79.

The spelling of 9937959917209 in words is "nine trillion, nine hundred thirty-seven billion, nine hundred fifty-nine million, nine hundred seventeen thousand, two hundred nine".