9894890984989 has 2 divisors, whose sum is σ = 9894890984990. Its totient is φ = 9894890984988.

The previous prime is 9894890984959. The next prime is 9894890985043.

9894890984989 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5588921528100 + 4305969456889 = 2364090^2 + 2075083^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 9894890984989 - 2³⁷ = 9757452031517 is a prime.

It is a super-3 number, since 3×9894890984989³ (a number of 40 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9894890984897 and 9894890984906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9894890984959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4947445492494 + 4947445492495.

It is an arithmetic number, because the mean of its divisors is an integer number (4947445492495).

Almost surely, 2^{9894890984989} is an apocalyptic number.

It is an amenable number.

9894890984989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9894890984989 is an equidigital number, since it uses as much as digits as its factorization.

9894890984989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34828517376, while the sum is 94.

The spelling of 9894890984989 in words is "nine trillion, eight hundred ninety-four billion, eight hundred ninety million, nine hundred eighty-four thousand, nine hundred eighty-nine".