1031309 has 2 divisors, whose sum is σ = 1031310. Its totient is φ = 1031308.

The previous prime is 1031299. The next prime is 1031323. The reversal of 1031309 is 9031301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 697225 + 334084 = 835^2 + 578^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031309 - 2⁸ = 1031053 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1031399) 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, 515654 + 515655.

It is an arithmetic number, because the mean of its divisors is an integer number (515655).

2^1031309 is an apocalyptic number.

It is an amenable number.

1031309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031309 is an equidigital number, since it uses as much as digits as its factorization.

1031309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 17.

The square root of 1031309 is about 1015.5338497559. The cubic root of 1031309 is about 101.0329272114.

The spelling of 1031309 in words is "one million, thirty-one thousand, three hundred nine".