998421163 has 2 divisors, whose sum is σ = 998421164. Its totient is φ = 998421162.

The previous prime is 998421133. The next prime is 998421167. The reversal of 998421163 is 361124899.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998421163 - 2¹³ = 998412971 is a prime.

It is not a weakly prime, because it can be changed into another prime (998421167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499210581 + 499210582.

It is an arithmetic number, because the mean of its divisors is an integer number (499210582).

Almost surely, 2^998421163 is an apocalyptic number.

998421163 is a deficient number, since it is larger than the sum of its proper divisors (1).

998421163 is an equidigital number, since it uses as much as digits as its factorization.

998421163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 998421163 is about 31597.8031356612. The cubic root of 998421163 is about 999.4734437872.

The spelling of 998421163 in words is "nine hundred ninety-eight million, four hundred twenty-one thousand, one hundred sixty-three".