9942799549 has 2 divisors, whose sum is σ = 9942799550. Its totient is φ = 9942799548.

The previous prime is 9942799543. The next prime is 9942799567. The reversal of 9942799549 is 9459972499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7762843449 + 2179956100 = 88107^2 + 46690^2 .

It is a cyclic number.

It is not a de Polignac number, because 9942799549 - 2⁹ = 9942799037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9942799543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4971399774 + 4971399775.

It is an arithmetic number, because the mean of its divisors is an integer number (4971399775).

Almost surely, 2^9942799549 is an apocalyptic number.

It is an amenable number.

9942799549 is a deficient number, since it is larger than the sum of its proper divisors (1).

9942799549 is an equidigital number, since it uses as much as digits as its factorization.

9942799549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66134880, while the sum is 67.

The square root of 9942799549 is about 99713.5875846416. The cubic root of 9942799549 is about 2150.3190115422.

The spelling of 9942799549 in words is "nine billion, nine hundred forty-two million, seven hundred ninety-nine thousand, five hundred forty-nine".