989898517 has 2 divisors, whose sum is σ = 989898518. Its totient is φ = 989898516.

The previous prime is 989898493. The next prime is 989898527. The reversal of 989898517 is 715898989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575328196 + 414570321 = 23986^2 + 20361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989898517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989898527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494949258 + 494949259.

It is an arithmetic number, because the mean of its divisors is an integer number (494949259).

Almost surely, 2^989898517 is an apocalyptic number.

It is an amenable number.

989898517 is a deficient number, since it is larger than the sum of its proper divisors (1).

989898517 is an equidigital number, since it uses as much as digits as its factorization.

989898517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 64.

The square root of 989898517 is about 31462.6527330421. The cubic root of 989898517 is about 996.6214371683.

The spelling of 989898517 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, five hundred seventeen".