1309489669 has 2 divisors, whose sum is σ = 1309489670. Its totient is φ = 1309489668.

The previous prime is 1309489627. The next prime is 1309489711. The reversal of 1309489669 is 9669849031.

It is a balanced prime because it is at equal distance from previous prime (1309489627) and next prime (1309489711).

It can be written as a sum of positive squares in only one way, i.e., 1106427169 + 203062500 = 33263^2 + 14250^2 .

It is an emirp because it is prime and its reverse (9669849031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1309489669 - 2⁷ = 1309489541 is a prime.

It is a super-2 number, since 2×1309489669² = 3429526386435459122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1309489609) 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, 654744834 + 654744835.

It is an arithmetic number, because the mean of its divisors is an integer number (654744835).

Almost surely, 2^1309489669 is an apocalyptic number.

1309489669 is the 20893-rd hex number.

It is an amenable number.

1309489669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309489669 is an equidigital number, since it uses as much as digits as its factorization.

1309489669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 1309489669 is about 36186.8715005871. The cubic root of 1309489669 is about 1094.0420773855.

The spelling of 1309489669 in words is "one billion, three hundred nine million, four hundred eighty-nine thousand, six hundred sixty-nine".