7288016521 has 2 divisors, whose sum is σ = 7288016522. Its totient is φ = 7288016520.

The previous prime is 7288016513. The next prime is 7288016531. The reversal of 7288016521 is 1256108827.

7288016521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6149696400 + 1138320121 = 78420^2 + 33739^2 .

It is a cyclic number.

It is not a de Polignac number, because 7288016521 - 2³ = 7288016513 is a prime.

It is not a weakly prime, because it can be changed into another prime (7288016531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3644008260 + 3644008261.

It is an arithmetic number, because the mean of its divisors is an integer number (3644008261).

Almost surely, 2^7288016521 is an apocalyptic number.

It is an amenable number.

7288016521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7288016521 is an equidigital number, since it uses as much as digits as its factorization.

7288016521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 7288016521 is about 85369.8806429996. The cubic root of 7288016521 is about 1938.8153500993.

It can be divided in two parts, 72880 and 16521, that added together give a square (89401 = 299²).

The spelling of 7288016521 in words is "seven billion, two hundred eighty-eight million, sixteen thousand, five hundred twenty-one".