9898468781 has 2 divisors, whose sum is σ = 9898468782. Its totient is φ = 9898468780.

The previous prime is 9898468759. The next prime is 9898468837. The reversal of 9898468781 is 1878648989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8106301225 + 1792167556 = 90035^2 + 42334^2 .

It is a cyclic number.

It is not a de Polignac number, because 9898468781 - 2⁶ = 9898468717 is a prime.

It is a super-2 number, since 2×9898468781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9891468781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4949234390 + 4949234391.

It is an arithmetic number, because the mean of its divisors is an integer number (4949234391).

Almost surely, 2^9898468781 is an apocalyptic number.

It is an amenable number.

9898468781 is a deficient number, since it is larger than the sum of its proper divisors (1).

9898468781 is an equidigital number, since it uses as much as digits as its factorization.

9898468781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55738368, while the sum is 68.

The square root of 9898468781 is about 99491.0487481160. The cubic root of 9898468781 is about 2147.1184603447.

The spelling of 9898468781 in words is "nine billion, eight hundred ninety-eight million, four hundred sixty-eight thousand, seven hundred eighty-one".