9628981 has 2 divisors, whose sum is σ = 9628982. Its totient is φ = 9628980.

The previous prime is 9628961. The next prime is 9629023. The reversal of 9628981 is 1898269.

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., 9090225 + 538756 = 3015^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 9628981 - 2⁹ = 9628469 is a prime.

It is a super-2 number, since 2×9628981² = 185434550196722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9628921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4814490 + 4814491.

It is an arithmetic number, because the mean of its divisors is an integer number (4814491).

Almost surely, 2^9628981 is an apocalyptic number.

It is an amenable number.

9628981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9628981 is an equidigital number, since it uses as much as digits as its factorization.

9628981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 43.

The square root of 9628981 is about 3103.0599414127. The cubic root of 9628981 is about 212.7453664018.

It can be divided in two parts, 9628 and 981, that added together give a square (10609 = 103²).

The spelling of 9628981 in words is "nine million, six hundred twenty-eight thousand, nine hundred eighty-one".