998730917 has 2 divisors, whose sum is σ = 998730918. Its totient is φ = 998730916.

The previous prime is 998730893. The next prime is 998730919. The reversal of 998730917 is 719037899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613354756 + 385376161 = 24766^2 + 19631^2 .

It is a cyclic number.

It is not a de Polignac number, because 998730917 - 2⁶ = 998730853 is a prime.

Together with 998730919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998730919) 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, 499365458 + 499365459.

It is an arithmetic number, because the mean of its divisors is an integer number (499365459).

Almost surely, 2^998730917 is an apocalyptic number.

It is an amenable number.

998730917 is a deficient number, since it is larger than the sum of its proper divisors (1).

998730917 is an equidigital number, since it uses as much as digits as its factorization.

998730917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 998730917 is about 31602.7042671984. The cubic root of 998730917 is about 999.5767932547.

It can be divided in two parts, 9987 and 30917, that added together give a palindrome (40904).

The spelling of 998730917 in words is "nine hundred ninety-eight million, seven hundred thirty thousand, nine hundred seventeen".