1313809 has 4 divisors (see below), whose sum is σ = 1501504. Its totient is φ = 1126116.

The previous prime is 1313797. The next prime is 1313813. The reversal of 1313809 is 9083131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1313809 - 2⁹ = 1313297 is a prime.

It is an Ulam number.

It is a Duffinian number.

1313809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1313839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93837 + ... + 93850.

It is an arithmetic number, because the mean of its divisors is an integer number (375376).

2^1313809 is an apocalyptic number.

It is an amenable number.

1313809 is a deficient number, since it is larger than the sum of its proper divisors (187695).

1313809 is an equidigital number, since it uses as much as digits as its factorization.

1313809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187694.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1313809 is about 1146.2150758038. The cubic root of 1313809 is about 109.5243650735.

The spelling of 1313809 in words is "one million, three hundred thirteen thousand, eight hundred nine".