7988012521 has 2 divisors, whose sum is σ = 7988012522. Its totient is φ = 7988012520.

The previous prime is 7988012477. The next prime is 7988012563. The reversal of 7988012521 is 1252108897.

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., 7985924496 + 2088025 = 89364^2 + 1445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7988012521 is a prime.

It is not a weakly prime, because it can be changed into another prime (7988016521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3994006260 + 3994006261.

It is an arithmetic number, because the mean of its divisors is an integer number (3994006261).

Almost surely, 2^7988012521 is an apocalyptic number.

It is an amenable number.

7988012521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7988012521 is an equidigital number, since it uses as much as digits as its factorization.

7988012521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 7988012521 is about 89375.6819330628. The cubic root of 7988012521 is about 1999.0005440438. Note that the first 3 decimals are identical.

The spelling of 7988012521 in words is "seven billion, nine hundred eighty-eight million, twelve thousand, five hundred twenty-one".