13478000521 has 2 divisors, whose sum is σ = 13478000522. Its totient is φ = 13478000520.

The previous prime is 13478000491. The next prime is 13478000563. The reversal of 13478000521 is 12500087431.

It is the 47396-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7737665296 + 5740335225 = 87964^2 + 75765^2 .

It is a cyclic number.

It is not a de Polignac number, because 13478000521 - 2⁵ = 13478000489 is a prime.

It is not a weakly prime, because it can be changed into another prime (13478003521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6739000260 + 6739000261.

It is an arithmetic number, because the mean of its divisors is an integer number (6739000261).

Almost surely, 2^13478000521 is an apocalyptic number.

It is an amenable number.

13478000521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13478000521 is an equidigital number, since it uses as much as digits as its factorization.

13478000521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

Adding to 13478000521 its reverse (12500087431), we get a palindrome (25978087952).

The spelling of 13478000521 in words is "thirteen billion, four hundred seventy-eight million, five hundred twenty-one", and thus it is an aban number.