9800621 has 2 divisors, whose sum is σ = 9800622. Its totient is φ = 9800620.

The previous prime is 9800617. The next prime is 9800629. The reversal of 9800621 is 1260089.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9796900 + 3721 = 3130^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 9800621 - 2² = 9800617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9800629) 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, 4900310 + 4900311.

It is an arithmetic number, because the mean of its divisors is an integer number (4900311).

Almost surely, 2^9800621 is an apocalyptic number.

It is an amenable number.

9800621 is a deficient number, since it is larger than the sum of its proper divisors (1).

9800621 is an equidigital number, since it uses as much as digits as its factorization.

9800621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 9800621 is about 3130.5943525152. The cubic root of 9800621 is about 214.0020161687.

The spelling of 9800621 in words is "nine million, eight hundred thousand, six hundred twenty-one".