9821744929 has 2 divisors, whose sum is σ = 9821744930. Its totient is φ = 9821744928.

The previous prime is 9821744909. The next prime is 9821744971. The reversal of 9821744929 is 9294471289.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7577354304 + 2244390625 = 87048^2 + 47375^2 .

It is a cyclic number.

It is not a de Polignac number, because 9821744929 - 2⁹ = 9821744417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9821744929.

It is not a weakly prime, because it can be changed into another prime (9821744909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4910872464 + 4910872465.

It is an arithmetic number, because the mean of its divisors is an integer number (4910872465).

Almost surely, 2^9821744929 is an apocalyptic number.

It is an amenable number.

9821744929 is a deficient number, since it is larger than the sum of its proper divisors (1).

9821744929 is an equidigital number, since it uses as much as digits as its factorization.

9821744929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 55.

The square root of 9821744929 is about 99104.7169866299. The cubic root of 9821744929 is about 2141.5565675455.

The spelling of 9821744929 in words is "nine billion, eight hundred twenty-one million, seven hundred forty-four thousand, nine hundred twenty-nine".