998728229 has 2 divisors, whose sum is σ = 998728230. Its totient is φ = 998728228.

The previous prime is 998728177. The next prime is 998728231. The reversal of 998728229 is 922827899.

998728229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 606292129 + 392436100 = 24623^2 + 19810^2 .

It is a cyclic number.

It is not a de Polignac number, because 998728229 - 2²⁴ = 981951013 is a prime.

Together with 998728231, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998728249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499364114 + 499364115.

It is an arithmetic number, because the mean of its divisors is an integer number (499364115).

Almost surely, 2^998728229 is an apocalyptic number.

It is an amenable number.

998728229 is a deficient number, since it is larger than the sum of its proper divisors (1).

998728229 is an equidigital number, since it uses as much as digits as its factorization.

998728229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 56.

The square root of 998728229 is about 31602.6617391637. The cubic root of 998728229 is about 999.5758964950.

The spelling of 998728229 in words is "nine hundred ninety-eight million, seven hundred twenty-eight thousand, two hundred twenty-nine".