998522647 has 2 divisors, whose sum is σ = 998522648. Its totient is φ = 998522646.

The previous prime is 998522627. The next prime is 998522699. The reversal of 998522647 is 746225899.

It is an a-pointer prime, because the next prime (998522699) can be obtained adding 998522647 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998522647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998522594 and 998522603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998522627) 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, 499261323 + 499261324.

It is an arithmetic number, because the mean of its divisors is an integer number (499261324).

Almost surely, 2^998522647 is an apocalyptic number.

998522647 is a deficient number, since it is larger than the sum of its proper divisors (1).

998522647 is an equidigital number, since it uses as much as digits as its factorization.

998522647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 52.

The square root of 998522647 is about 31599.4089659918. The cubic root of 998522647 is about 999.5073062928.

The spelling of 998522647 in words is "nine hundred ninety-eight million, five hundred twenty-two thousand, six hundred forty-seven".