98840921 has 2 divisors, whose sum is σ = 98840922. Its totient is φ = 98840920.

The previous prime is 98840909. The next prime is 98840969. The reversal of 98840921 is 12904889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86862400 + 11978521 = 9320^2 + 3461^2 .

It is a cyclic number.

It is not a de Polignac number, because 98840921 - 2⁶ = 98840857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (98845921) 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, 49420460 + 49420461.

It is an arithmetic number, because the mean of its divisors is an integer number (49420461).

Almost surely, 2^98840921 is an apocalyptic number.

It is an amenable number.

98840921 is a deficient number, since it is larger than the sum of its proper divisors (1).

98840921 is an equidigital number, since it uses as much as digits as its factorization.

98840921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 98840921 is about 9941.8771366377. The cubic root of 98840921 is about 462.3585870073.

The spelling of 98840921 in words is "ninety-eight million, eight hundred forty thousand, nine hundred twenty-one".