56789898521 has 2 divisors, whose sum is σ = 56789898522. Its totient is φ = 56789898520.

The previous prime is 56789898509. The next prime is 56789898553. The reversal of 56789898521 is 12589898765.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56015055625 + 774842896 = 236675^2 + 27836^2 .

It is a cyclic number.

It is not a de Polignac number, because 56789898521 - 2¹⁰ = 56789897497 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (56789298521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28394949260 + 28394949261.

It is an arithmetic number, because the mean of its divisors is an integer number (28394949261).

Almost surely, 2^56789898521 is an apocalyptic number.

It is an amenable number.

56789898521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56789898521 is an equidigital number, since it uses as much as digits as its factorization.

56789898521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87091200, while the sum is 68.

The spelling of 56789898521 in words is "fifty-six billion, seven hundred eighty-nine million, eight hundred ninety-eight thousand, five hundred twenty-one".