8999381 has 2 divisors, whose sum is σ = 8999382. Its totient is φ = 8999380.

The previous prime is 8999359. The next prime is 8999383. The reversal of 8999381 is 1839998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5880625 + 3118756 = 2425^2 + 1766^2 .

It is a cyclic number.

It is not a de Polignac number, because 8999381 - 2⁶ = 8999317 is a prime.

It is a super-2 number, since 2×8999381² = 161977716766322, which contains 22 as substring.

Together with 8999383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8999383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4499690 + 4499691.

It is an arithmetic number, because the mean of its divisors is an integer number (4499691).

Almost surely, 2^8999381 is an apocalyptic number.

It is an amenable number.

8999381 is a deficient number, since it is larger than the sum of its proper divisors (1).

8999381 is an equidigital number, since it uses as much as digits as its factorization.

8999381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 47.

The square root of 8999381 is about 2999.8968315594. The cubic root of 8999381 is about 208.0036134111.

The spelling of 8999381 in words is "eight million, nine hundred ninety-nine thousand, three hundred eighty-one".