98921729 has 2 divisors, whose sum is σ = 98921730. Its totient is φ = 98921728.

The previous prime is 98921707. The next prime is 98921731. The reversal of 98921729 is 92712989.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60481729 + 38440000 = 7777^2 + 6200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98921729 is a prime.

Together with 98921731, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (98921029) 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, 49460864 + 49460865.

It is an arithmetic number, because the mean of its divisors is an integer number (49460865).

Almost surely, 2^98921729 is an apocalyptic number.

It is an amenable number.

98921729 is a deficient number, since it is larger than the sum of its proper divisors (1).

98921729 is an equidigital number, since it uses as much as digits as its factorization.

98921729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 98921729 is about 9945.9403275910. The cubic root of 98921729 is about 462.4845540495.

The spelling of 98921729 in words is "ninety-eight million, nine hundred twenty-one thousand, seven hundred twenty-nine".