998747917 has 2 divisors, whose sum is σ = 998747918. Its totient is φ = 998747916.

The previous prime is 998747891. The next prime is 998747921. The reversal of 998747917 is 719747899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544802281 + 453945636 = 23341^2 + 21306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998747917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998747927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499373958 + 499373959.

It is an arithmetic number, because the mean of its divisors is an integer number (499373959).

Almost surely, 2^998747917 is an apocalyptic number.

It is an amenable number.

998747917 is a deficient number, since it is larger than the sum of its proper divisors (1).

998747917 is an equidigital number, since it uses as much as digits as its factorization.

998747917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8001504, while the sum is 61.

The square root of 998747917 is about 31602.9732303782. The cubic root of 998747917 is about 999.5824646885.

The spelling of 998747917 in words is "nine hundred ninety-eight million, seven hundred forty-seven thousand, nine hundred seventeen".