7991488513 has 2 divisors, whose sum is σ = 7991488514. Its totient is φ = 7991488512.

The previous prime is 7991488471. The next prime is 7991488523. The reversal of 7991488513 is 3158841997.

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., 7169347584 + 822140929 = 84672^2 + 28673^2 .

It is an emirp because it is prime and its reverse (3158841997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7991488513 - 2¹⁷ = 7991357441 is a prime.

It is not a weakly prime, because it can be changed into another prime (7991488523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3995744256 + 3995744257.

It is an arithmetic number, because the mean of its divisors is an integer number (3995744257).

Almost surely, 2^7991488513 is an apocalyptic number.

It is an amenable number.

7991488513 is a deficient number, since it is larger than the sum of its proper divisors (1).

7991488513 is an equidigital number, since it uses as much as digits as its factorization.

7991488513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 55.

The square root of 7991488513 is about 89395.1257787582. The cubic root of 7991488513 is about 1999.2904577213.

The spelling of 7991488513 in words is "seven billion, nine hundred ninety-one million, four hundred eighty-eight thousand, five hundred thirteen".