8311640549 has 2 divisors, whose sum is σ = 8311640550. Its totient is φ = 8311640548.

The previous prime is 8311640531. The next prime is 8311640551. The reversal of 8311640549 is 9450461138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8302489924 + 9150625 = 91118^2 + 3025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8311640549 is a prime.

It is a Sophie Germain prime.

Together with 8311640551, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8311640509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4155820274 + 4155820275.

It is an arithmetic number, because the mean of its divisors is an integer number (4155820275).

Almost surely, 2^8311640549 is an apocalyptic number.

It is an amenable number.

8311640549 is a deficient number, since it is larger than the sum of its proper divisors (1).

8311640549 is an equidigital number, since it uses as much as digits as its factorization.

8311640549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 8311640549 is about 91168.1992199034. The cubic root of 8311640549 is about 2025.6399378876.

The spelling of 8311640549 in words is "eight billion, three hundred eleven million, six hundred forty thousand, five hundred forty-nine".