989381 has 2 divisors, whose sum is σ = 989382. Its totient is φ = 989380.

The previous prime is 989377. The next prime is 989411. The reversal of 989381 is 183989.

989381 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., 801025 + 188356 = 895^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 989381 - 2² = 989377 is a prime.

It is a super-2 number, since 2×989381² = 1957749526322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494690 + 494691.

It is an arithmetic number, because the mean of its divisors is an integer number (494691).

2⁹⁸⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

989381 is a deficient number, since it is larger than the sum of its proper divisors (1).

989381 is an equidigital number, since it uses as much as digits as its factorization.

989381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 989381 is about 994.6763292650. The cubic root of 989381 is about 99.6447729650.

The spelling of 989381 in words is "nine hundred eighty-nine thousand, three hundred eighty-one".