1318591 has 4 divisors (see below), whose sum is σ = 1341000. Its totient is φ = 1296184.

The previous prime is 1318579. The next prime is 1318609. The reversal of 1318591 is 1958131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1318591 - 2⁷ = 1318463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318991) 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 in 3 ways as a sum of consecutive naturals, for example, 11116 + ... + 11233.

It is an arithmetic number, because the mean of its divisors is an integer number (335250).

2^1318591 is an apocalyptic number.

1318591 is a deficient number, since it is larger than the sum of its proper divisors (22409).

1318591 is an equidigital number, since it uses as much as digits as its factorization.

1318591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22408.

The product of its digits is 1080, while the sum is 28.

The square root of 1318591 is about 1148.2991770440. The cubic root of 1318591 is about 109.6570863831.

The spelling of 1318591 in words is "one million, three hundred eighteen thousand, five hundred ninety-one".