9981229 has 2 divisors, whose sum is σ = 9981230. Its totient is φ = 9981228.

The previous prime is 9981221. The next prime is 9981271. The reversal of 9981229 is 9221899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6734025 + 3247204 = 2595^2 + 1802^2 .

It is a cyclic number.

It is not a de Polignac number, because 9981229 - 2³ = 9981221 is a prime.

9981229 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 9981191 and 9981200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9981221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990614 + 4990615.

It is an arithmetic number, because the mean of its divisors is an integer number (4990615).

Almost surely, 2^9981229 is an apocalyptic number.

It is an amenable number.

9981229 is a deficient number, since it is larger than the sum of its proper divisors (1).

9981229 is an equidigital number, since it uses as much as digits as its factorization.

9981229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 40.

The square root of 9981229 is about 3159.3083103743. The cubic root of 9981229 is about 215.3085815903.

The spelling of 9981229 in words is "nine million, nine hundred eighty-one thousand, two hundred twenty-nine".