981289 has 2 divisors, whose sum is σ = 981290. Its totient is φ = 981288.

The previous prime is 981287. The next prime is 981301. The reversal of 981289 is 982189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627264 + 354025 = 792^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 981289 - 2¹ = 981287 is a prime.

Together with 981287, it forms a pair of twin primes.

981289 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (981283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490644 + 490645.

It is an arithmetic number, because the mean of its divisors is an integer number (490645).

2⁹⁸¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

981289 is a deficient number, since it is larger than the sum of its proper divisors (1).

981289 is an equidigital number, since it uses as much as digits as its factorization.

981289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 37.

The square root of 981289 is about 990.6003230365. The cubic root of 981289 is about 99.3723690349.

Subtracting from 981289 its product of digits (10368), we obtain a triangular number (970921 = T₁₃₉₃).

Subtracting 981289 from its reverse (982189), we obtain a square (900 = 30²).

The spelling of 981289 in words is "nine hundred eighty-one thousand, two hundred eighty-nine".