998193517 has 2 divisors, whose sum is σ = 998193518. Its totient is φ = 998193516.

The previous prime is 998193487. The next prime is 998193527. The reversal of 998193517 is 715391899.

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., 958893156 + 39300361 = 30966^2 + 6269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998193517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998193527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499096758 + 499096759.

It is an arithmetic number, because the mean of its divisors is an integer number (499096759).

Almost surely, 2^998193517 is an apocalyptic number.

It is an amenable number.

998193517 is a deficient number, since it is larger than the sum of its proper divisors (1).

998193517 is an equidigital number, since it uses as much as digits as its factorization.

998193517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 52.

The square root of 998193517 is about 31594.2006862019. The cubic root of 998193517 is about 999.3974760378.

The spelling of 998193517 in words is "nine hundred ninety-eight million, one hundred ninety-three thousand, five hundred seventeen".