8478240521 has 2 divisors, whose sum is σ = 8478240522. Its totient is φ = 8478240520.

The previous prime is 8478240503. The next prime is 8478240539. The reversal of 8478240521 is 1250428748.

It is a balanced prime because it is at equal distance from previous prime (8478240503) and next prime (8478240539).

It can be written as a sum of positive squares in only one way, i.e., 4679244025 + 3798996496 = 68405^2 + 61636^2 .

It is a cyclic number.

It is not a de Polignac number, because 8478240521 - 2⁶ = 8478240457 is a prime.

It is not a weakly prime, because it can be changed into another prime (8478240541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4239120260 + 4239120261.

It is an arithmetic number, because the mean of its divisors is an integer number (4239120261).

Almost surely, 2^8478240521 is an apocalyptic number.

It is an amenable number.

8478240521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8478240521 is an equidigital number, since it uses as much as digits as its factorization.

8478240521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 143360, while the sum is 41.

The square root of 8478240521 is about 92077.3616096812. The cubic root of 8478240521 is about 2039.0845983476.

The spelling of 8478240521 in words is "eight billion, four hundred seventy-eight million, two hundred forty thousand, five hundred twenty-one".