1318891 has 16 divisors (see below), whose sum is σ = 1598400. Its totient is φ = 1064448.

The previous prime is 1318883. The next prime is 1318897. The reversal of 1318891 is 1988131.

It is not a de Polignac number, because 1318891 - 2³ = 1318883 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 (1318897) 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 15 ways as a sum of consecutive naturals, for example, 14775 + ... + 14863.

It is an arithmetic number, because the mean of its divisors is an integer number (99900).

2^1318891 is an apocalyptic number.

1318891 is a deficient number, since it is larger than the sum of its proper divisors (279509).

1318891 is an equidigital number, since it uses as much as digits as its factorization.

1318891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198.

The product of its digits is 1728, while the sum is 31.

The square root of 1318891 is about 1148.4297975932. The cubic root of 1318891 is about 109.6654019845.

It can be divided in two parts, 1318 and 891, that added together give a square (2209 = 47²).

The spelling of 1318891 in words is "one million, three hundred eighteen thousand, eight hundred ninety-one".