9745539521 has 2 divisors, whose sum is σ = 9745539522. Its totient is φ = 9745539520.

The previous prime is 9745539509. The next prime is 9745539593. The reversal of 9745539521 is 1259355479.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5382276496 + 4363263025 = 73364^2 + 66055^2 .

It is a cyclic number.

It is not a de Polignac number, because 9745539521 - 2¹⁰ = 9745538497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9745539521.

It is not a weakly prime, because it can be changed into another prime (9745539121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4872769760 + 4872769761.

It is an arithmetic number, because the mean of its divisors is an integer number (4872769761).

Almost surely, 2^9745539521 is an apocalyptic number.

It is an amenable number.

9745539521 is a deficient number, since it is larger than the sum of its proper divisors (1).

9745539521 is an equidigital number, since it uses as much as digits as its factorization.

9745539521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1701000, while the sum is 50.

The square root of 9745539521 is about 98719.4991934218. The cubic root of 9745539521 is about 2136.0035115955.

The spelling of 9745539521 in words is "nine billion, seven hundred forty-five million, five hundred thirty-nine thousand, five hundred twenty-one".