998343817 has 2 divisors, whose sum is σ = 998343818. Its totient is φ = 998343816.

The previous prime is 998343791. The next prime is 998343949. The reversal of 998343817 is 718343899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 574848576 + 423495241 = 23976^2 + 20579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998343817 is a prime.

It is not a weakly prime, because it can be changed into another prime (998343517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499171908 + 499171909.

It is an arithmetic number, because the mean of its divisors is an integer number (499171909).

Almost surely, 2^998343817 is an apocalyptic number.

It is an amenable number.

998343817 is a deficient number, since it is larger than the sum of its proper divisors (1).

998343817 is an equidigital number, since it uses as much as digits as its factorization.

998343817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 998343817 is about 31596.5791977549. The cubic root of 998343817 is about 999.4476339479.

The spelling of 998343817 in words is "nine hundred ninety-eight million, three hundred forty-three thousand, eight hundred seventeen".