1001389 has 2 divisors, whose sum is σ = 1001390. Its totient is φ = 1001388.

The previous prime is 1001387. The next prime is 1001401. The reversal of 1001389 is 9831001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 736164 + 265225 = 858^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001389 - 2¹ = 1001387 is a prime.

Together with 1001387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500694 + 500695.

It is an arithmetic number, because the mean of its divisors is an integer number (500695).

2^1001389 is an apocalyptic number.

It is an amenable number.

1001389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001389 is an equidigital number, since it uses as much as digits as its factorization.

1001389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1001389 is about 1000.6942590022. The cubic root of 1001389 is about 100.0462785796.

The spelling of 1001389 in words is "one million, one thousand, three hundred eighty-nine".