9772544021 has 2 divisors, whose sum is σ = 9772544022. Its totient is φ = 9772544020.

The previous prime is 9772543931. The next prime is 9772544057. The reversal of 9772544021 is 1204452779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8322000625 + 1450543396 = 91225^2 + 38086^2 .

It is an emirp because it is prime and its reverse (1204452779) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9772544021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9772544021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9772544321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4886272010 + 4886272011.

It is an arithmetic number, because the mean of its divisors is an integer number (4886272011).

Almost surely, 2^9772544021 is an apocalyptic number.

It is an amenable number.

9772544021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9772544021 is an equidigital number, since it uses as much as digits as its factorization.

9772544021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 9772544021 is about 98856.1784664975. The cubic root of 9772544021 is about 2137.9746188448.

The spelling of 9772544021 in words is "nine billion, seven hundred seventy-two million, five hundred forty-four thousand, twenty-one".