998991167 has 2 divisors, whose sum is σ = 998991168. Its totient is φ = 998991166.

The previous prime is 998991121. The next prime is 998991173. The reversal of 998991167 is 761199899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998991167 - 2¹⁰ = 998990143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998991107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499495583 + 499495584.

It is an arithmetic number, because the mean of its divisors is an integer number (499495584).

Almost surely, 2^998991167 is an apocalyptic number.

998991167 is a deficient number, since it is larger than the sum of its proper divisors (1).

998991167 is an equidigital number, since it uses as much as digits as its factorization.

998991167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 59.

The square root of 998991167 is about 31606.8215263731. The cubic root of 998991167 is about 999.6636091872.

The spelling of 998991167 in words is "nine hundred ninety-eight million, nine hundred ninety-one thousand, one hundred sixty-seven".