109784207569 has 3 divisors (see below), whose sum is σ = 109784538907. Its totient is φ = 109783876232.

The previous prime is 109784207551. The next prime is 109784207573. The reversal of 109784207569 is 965702487901.

The square root of 109784207569 is 331337.

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, and also an emirpimes, since its reverse is a distinct semiprime: 965702487901 = 491 ⋅1966807511.

It can be written as a sum of positive squares in only one way, i.e., 82331694225 + 27452513344 = 286935^2 + 165688^2 .

It is not a de Polignac number, because 109784207569 - 2¹⁹ = 109783683281 is a prime.

It is a super-2 number, since 2×109784207569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109764207569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 165669 + ... + 497005.

Almost surely, 2^109784207569 is an apocalyptic number.

109784207569 is the 331337-th square number.

109784207569 is the 165669-th centered octagonal number.

It is an amenable number.

109784207569 is a deficient number, since it is larger than the sum of its proper divisors (331338).

109784207569 is an frugal number, since it uses more digits than its factorization.

109784207569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662674 (or 331337 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 109784207569 in words is "one hundred nine billion, seven hundred eighty-four million, two hundred seven thousand, five hundred sixty-nine".