7991097883609 has 3 divisors (see below), whose sum is σ = 7991100710463. Its totient is φ = 7991095056756.

The previous prime is 7991097883597. The next prime is 7991097883619. The reversal of 7991097883609 is 9063887901997.

The square root of 7991097883609 is 2826853.

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., 6751500673225 + 1239597210384 = 2598365^2 + 1113372^2 .

It is not a de Polignac number, because 7991097883609 - 2¹³ = 7991097875417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7991097883619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1413427 + ... + 4240279.

It is an arithmetic number, because the mean of its divisors is an integer number (2663700236821).

Almost surely, 2^{7991097883609} is an apocalyptic number.

7991097883609 is the 2826853-rd square number.

7991097883609 is the 1413427-th centered octagonal number.

It is an amenable number.

7991097883609 is a deficient number, since it is larger than the sum of its proper divisors (2826854).

7991097883609 is an frugal number, since it uses more digits than its factorization.

7991097883609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5653706 (or 2826853 counting only the distinct ones).

The product of its (nonzero) digits is 370355328, while the sum is 76.

The spelling of 7991097883609 in words is "seven trillion, nine hundred ninety-one billion, ninety-seven million, eight hundred eighty-three thousand, six hundred nine".