998623481 has 2 divisors, whose sum is σ = 998623482. Its totient is φ = 998623480.

The previous prime is 998623441. The next prime is 998623519. The reversal of 998623481 is 184326899.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 998244025 + 379456 = 31595^2 + 616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998623481 is a prime.

It is a super-2 number, since 2×998623481² = 1994497713609114722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (998623441) 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, 499311740 + 499311741.

It is an arithmetic number, because the mean of its divisors is an integer number (499311741).

Almost surely, 2^998623481 is an apocalyptic number.

It is an amenable number.

998623481 is a deficient number, since it is larger than the sum of its proper divisors (1).

998623481 is an equidigital number, since it uses as much as digits as its factorization.

998623481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 50.

The square root of 998623481 is about 31601.0044302392. The cubic root of 998623481 is about 999.5409496383.

The spelling of 998623481 in words is "nine hundred ninety-eight million, six hundred twenty-three thousand, four hundred eighty-one".