998305421 has 2 divisors, whose sum is σ = 998305422. Its totient is φ = 998305420.

The previous prime is 998305411. The next prime is 998305453. The reversal of 998305421 is 124503899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 965655625 + 32649796 = 31075^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 998305421 - 2²² = 994111117 is a prime.

It is a super-2 number, since 2×998305421² = 1993227427195974482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_50765864 and since 998305421 and 50765864 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998305411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499152710 + 499152711.

It is an arithmetic number, because the mean of its divisors is an integer number (499152711).

Almost surely, 2^998305421 is an apocalyptic number.

It is an amenable number.

998305421 is a deficient number, since it is larger than the sum of its proper divisors (1).

998305421 is an equidigital number, since it uses as much as digits as its factorization.

998305421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 998305421 is about 31595.9715944929. The cubic root of 998305421 is about 999.4348209662.

The spelling of 998305421 in words is "nine hundred ninety-eight million, three hundred five thousand, four hundred twenty-one".