98643989 has 2 divisors, whose sum is σ = 98643990. Its totient is φ = 98643988.

The previous prime is 98643967. The next prime is 98643997. The reversal of 98643989 is 98934689.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60575089 + 38068900 = 7783^2 + 6170^2 .

It is a cyclic number.

It is not a de Polignac number, because 98643989 - 2²⁰ = 97595413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98643949) 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, 49321994 + 49321995.

It is an arithmetic number, because the mean of its divisors is an integer number (49321995).

Almost surely, 2^98643989 is an apocalyptic number.

It is an amenable number.

98643989 is a deficient number, since it is larger than the sum of its proper divisors (1).

98643989 is an equidigital number, since it uses as much as digits as its factorization.

98643989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 56.

The square root of 98643989 is about 9931.9680325704. The cubic root of 98643989 is about 462.0513129915.

The spelling of 98643989 in words is "ninety-eight million, six hundred forty-three thousand, nine hundred eighty-nine".