998951689 has 2 divisors, whose sum is σ = 998951690. Its totient is φ = 998951688.

The previous prime is 998951627. The next prime is 998951699. The reversal of 998951689 is 986159899.

998951689 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., 852348025 + 146603664 = 29195^2 + 12108^2 .

It is a cyclic number.

It is not a de Polignac number, because 998951689 - 2⁷ = 998951561 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 998951689.

It is not a weakly prime, because it can be changed into another prime (998951609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499475844 + 499475845.

It is an arithmetic number, because the mean of its divisors is an integer number (499475845).

Almost surely, 2^998951689 is an apocalyptic number.

It is an amenable number.

998951689 is a deficient number, since it is larger than the sum of its proper divisors (1).

998951689 is an equidigital number, since it uses as much as digits as its factorization.

998951689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12597120, while the sum is 64.

The square root of 998951689 is about 31606.1970031195. The cubic root of 998951689 is about 999.6504408226.

The spelling of 998951689 in words is "nine hundred ninety-eight million, nine hundred fifty-one thousand, six hundred eighty-nine".