6749115409 has 3 divisors (see below), whose sum is σ = 6749197563. Its totient is φ = 6749033256.

The previous prime is 6749115403. The next prime is 6749115449. The reversal of 6749115409 is 9045119476.

The square root of 6749115409 is 82153.

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., 1292043025 + 5457072384 = 35945^2 + 73872^2 .

It is not a de Polignac number, because 6749115409 - 2¹³ = 6749107217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6749115403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 41077 + ... + 123229.

It is an arithmetic number, because the mean of its divisors is an integer number (2249732521).

Almost surely, 2^6749115409 is an apocalyptic number.

6749115409 is the 82153-rd square number.

6749115409 is the 41077-th centered octagonal number.

It is an amenable number.

6749115409 is a deficient number, since it is larger than the sum of its proper divisors (82154).

6749115409 is an frugal number, since it uses more digits than its factorization.

6749115409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164306 (or 82153 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The cubic root of 6749115409 is about 1889.7990145822.

The spelling of 6749115409 in words is "six billion, seven hundred forty-nine million, one hundred fifteen thousand, four hundred nine".