98638819 has 2 divisors, whose sum is σ = 98638820. Its totient is φ = 98638818.

The previous prime is 98638817. The next prime is 98638871. The reversal of 98638819 is 91883689.

It is an a-pointer prime, because the next prime (98638871) can be obtained adding 98638819 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 98638819 - 2¹ = 98638817 is a prime.

It is a super-2 number, since 2×98638819² = 19459233227429522, which contains 22 as substring.

Together with 98638817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (98638817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49319409 + 49319410.

It is an arithmetic number, because the mean of its divisors is an integer number (49319410).

Almost surely, 2^98638819 is an apocalyptic number.

98638819 is a deficient number, since it is larger than the sum of its proper divisors (1).

98638819 is an equidigital number, since it uses as much as digits as its factorization.

98638819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 52.

The square root of 98638819 is about 9931.7077584875. The cubic root of 98638819 is about 462.0432407071.

The spelling of 98638819 in words is "ninety-eight million, six hundred thirty-eight thousand, eight hundred nineteen".