381289 has 2 divisors, whose sum is σ = 381290. Its totient is φ = 381288.

The previous prime is 381287. The next prime is 381301. The reversal of 381289 is 982183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270400 + 110889 = 520^2 + 333^2 .

It is an emirp because it is prime and its reverse (982183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381289 - 2¹ = 381287 is a prime.

Together with 381287, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 381289.

It is not a weakly prime, because it can be changed into another prime (381287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190644 + 190645.

It is an arithmetic number, because the mean of its divisors is an integer number (190645).

2³⁸¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

381289 is a deficient number, since it is larger than the sum of its proper divisors (1).

381289 is an equidigital number, since it uses as much as digits as its factorization.

381289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 381289 is about 617.4860322307. The cubic root of 381289 is about 72.5133705027.

The spelling of 381289 in words is "three hundred eighty-one thousand, two hundred eighty-nine".