998421167 has 2 divisors, whose sum is σ = 998421168. Its totient is φ = 998421166.

The previous prime is 998421163. The next prime is 998421199. The reversal of 998421167 is 761124899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998421167 - 2² = 998421163 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 (998421163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499210583 + 499210584.

It is an arithmetic number, because the mean of its divisors is an integer number (499210584).

Almost surely, 2^998421167 is an apocalyptic number.

998421167 is a deficient number, since it is larger than the sum of its proper divisors (1).

998421167 is an equidigital number, since it uses as much as digits as its factorization.

998421167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 998421167 is about 31597.8031989567. The cubic root of 998421167 is about 999.4734451220.

The spelling of 998421167 in words is "nine hundred ninety-eight million, four hundred twenty-one thousand, one hundred sixty-seven".