998971517 has 2 divisors, whose sum is σ = 998971518. Its totient is φ = 998971516.

The previous prime is 998971513. The next prime is 998971529. The reversal of 998971517 is 715179899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 985583236 + 13388281 = 31394^2 + 3659^2 .

It is a cyclic number.

It is not a de Polignac number, because 998971517 - 2² = 998971513 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998971513) 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, 499485758 + 499485759.

It is an arithmetic number, because the mean of its divisors is an integer number (499485759).

Almost surely, 2^998971517 is an apocalyptic number.

It is an amenable number.

998971517 is a deficient number, since it is larger than the sum of its proper divisors (1).

998971517 is an equidigital number, since it uses as much as digits as its factorization.

998971517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 56.

The square root of 998971517 is about 31606.5106742266. The cubic root of 998971517 is about 999.6570547353.

The spelling of 998971517 in words is "nine hundred ninety-eight million, nine hundred seventy-one thousand, five hundred seventeen".