6861597509 has 16 divisors (see below), whose sum is σ = 7855370880. Its totient is φ = 5940993600.

The previous prime is 6861597499. The next prime is 6861597527. The reversal of 6861597509 is 9057951686.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6861597509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6861597109) 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 15 ways as a sum of consecutive naturals, for example, 112577 + ... + 162470.

It is an arithmetic number, because the mean of its divisors is an integer number (490960680).

Almost surely, 2^6861597509 is an apocalyptic number.

It is an amenable number.

6861597509 is a deficient number, since it is larger than the sum of its proper divisors (993773371).

6861597509 is a wasteful number, since it uses less digits than its factorization.

6861597509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275180.

The product of its (nonzero) digits is 4082400, while the sum is 56.

The square root of 6861597509 is about 82834.7602700702. The cubic root of 6861597509 is about 1900.2398135897.

The spelling of 6861597509 in words is "six billion, eight hundred sixty-one million, five hundred ninety-seven thousand, five hundred nine".