8209613849 has 2 divisors, whose sum is σ = 8209613850. Its totient is φ = 8209613848.

The previous prime is 8209613831. The next prime is 8209613851. The reversal of 8209613849 is 9483169028.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6557760400 + 1651853449 = 80980^2 + 40643^2 .

It is a cyclic number.

It is not a de Polignac number, because 8209613849 - 2⁸ = 8209613593 is a prime.

Together with 8209613851, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8209613797 and 8209613806.

It is not a weakly prime, because it can be changed into another prime (8209613549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4104806924 + 4104806925.

It is an arithmetic number, because the mean of its divisors is an integer number (4104806925).

Almost surely, 2^8209613849 is an apocalyptic number.

It is an amenable number.

8209613849 is a deficient number, since it is larger than the sum of its proper divisors (1).

8209613849 is an equidigital number, since it uses as much as digits as its factorization.

8209613849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 8209613849 is about 90606.9194322376. The cubic root of 8209613849 is about 2017.3174410844.

The spelling of 8209613849 in words is "eight billion, two hundred nine million, six hundred thirteen thousand, eight hundred forty-nine".