1310809 has 2 divisors, whose sum is σ = 1310810. Its totient is φ = 1310808.

The previous prime is 1310807. The next prime is 1310851. The reversal of 1310809 is 9080131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 944784 + 366025 = 972^2 + 605^2 .

It is an emirp because it is prime and its reverse (9080131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1310809 - 2¹ = 1310807 is a prime.

Together with 1310807, it forms a pair of twin primes.

It is equal to p₁₀₀₇₉₅ and since 1310809 and 100795 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1310809.

It is not a weakly prime, because it can be changed into another prime (1310801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655404 + 655405.

It is an arithmetic number, because the mean of its divisors is an integer number (655405).

2^1310809 is an apocalyptic number.

It is an amenable number.

1310809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1310809 is an equidigital number, since it uses as much as digits as its factorization.

1310809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1310809 is about 1144.9056729705. The cubic root of 1310809 is about 109.4409375472.

Adding to 1310809 its product of nonzero digits (216), we get a square (1311025 = 1145²).

The spelling of 1310809 in words is "one million, three hundred ten thousand, eight hundred nine".