998815117 has 2 divisors, whose sum is σ = 998815118. Its totient is φ = 998815116.

The previous prime is 998815099. The next prime is 998815121. The reversal of 998815117 is 711518899.

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., 875804836 + 123010281 = 29594^2 + 11091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998815117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998815417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499407558 + 499407559.

It is an arithmetic number, because the mean of its divisors is an integer number (499407559).

Almost surely, 2^998815117 is an apocalyptic number.

It is an amenable number.

998815117 is a deficient number, since it is larger than the sum of its proper divisors (1).

998815117 is an equidigital number, since it uses as much as digits as its factorization.

998815117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 49.

The square root of 998815117 is about 31604.0364035988. The cubic root of 998815117 is about 999.6048829030.

The spelling of 998815117 in words is "nine hundred ninety-eight million, eight hundred fifteen thousand, one hundred seventeen".