8691409409 has 24 divisors (see below), whose sum is σ = 9570553080. Its totient is φ = 7884988416.

The previous prime is 8691409403. The next prime is 8691409411. The reversal of 8691409409 is 9049041968.

It is a happy number.

8691409409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 144961600 + 8546447809 = 12040^2 + 92447^2 .

It is not a de Polignac number, because 8691409409 - 2¹² = 8691405313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8691409403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1161809 + ... + 1169265.

It is an arithmetic number, because the mean of its divisors is an integer number (398773045).

Almost surely, 2^8691409409 is an apocalyptic number.

It is an amenable number.

8691409409 is a deficient number, since it is larger than the sum of its proper divisors (879143671).

8691409409 is a wasteful number, since it uses less digits than its factorization.

8691409409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7637 (or 7620 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 8691409409 is about 93227.7287559876. The cubic root of 8691409409 is about 2056.0329447886.

The spelling of 8691409409 in words is "eight billion, six hundred ninety-one million, four hundred nine thousand, four hundred nine".