1305289 has 2 divisors, whose sum is σ = 1305290. Its totient is φ = 1305288.

The previous prime is 1305287. The next prime is 1305301. The reversal of 1305289 is 9825031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1247689 + 57600 = 1117^2 + 240^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305289 - 2¹ = 1305287 is a prime.

Together with 1305287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1305287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652644 + 652645.

It is an arithmetic number, because the mean of its divisors is an integer number (652645).

2^1305289 is an apocalyptic number.

It is an amenable number.

1305289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305289 is an equidigital number, since it uses as much as digits as its factorization.

1305289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1305289 is about 1142.4924507409. The cubic root of 1305289 is about 109.2870977003.

The spelling of 1305289 in words is "one million, three hundred five thousand, two hundred eighty-nine".