9881381 has 2 divisors, whose sum is σ = 9881382. Its totient is φ = 9881380.

The previous prime is 9881363. The next prime is 9881401. The reversal of 9881381 is 1831889.

9881381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7896100 + 1985281 = 2810^2 + 1409^2 .

It is a cyclic number.

It is not a de Polignac number, because 9881381 - 2¹⁰ = 9880357 is a prime.

It is a super-2 number, since 2×9881381² = 195283380934322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9881321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4940690 + 4940691.

It is an arithmetic number, because the mean of its divisors is an integer number (4940691).

Almost surely, 2^9881381 is an apocalyptic number.

It is an amenable number.

9881381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9881381 is an equidigital number, since it uses as much as digits as its factorization.

9881381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 38.

The square root of 9881381 is about 3143.4663987388. The cubic root of 9881381 is about 214.5882221234.

The spelling of 9881381 in words is "nine million, eight hundred eighty-one thousand, three hundred eighty-one".