9800890381 has 2 divisors, whose sum is σ = 9800890382. Its totient is φ = 9800890380.

The previous prime is 9800890357. The next prime is 9800890391. The reversal of 9800890381 is 1830980089.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9203332356 + 597558025 = 95934^2 + 24445^2 .

It is an emirp because it is prime and its reverse (1830980089) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9800890381 - 2²¹ = 9798793229 is a prime.

It is a super-2 number, since 2×9800890381² (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 (9800890301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4900445190 + 4900445191.

It is an arithmetic number, because the mean of its divisors is an integer number (4900445191).

Almost surely, 2^9800890381 is an apocalyptic number.

It is an amenable number.

9800890381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9800890381 is an equidigital number, since it uses as much as digits as its factorization.

9800890381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 9800890381 is about 98999.4463671388. The cubic root of 9800890381 is about 2140.0397684548.

The spelling of 9800890381 in words is "nine billion, eight hundred million, eight hundred ninety thousand, three hundred eighty-one".