1289091 has 8 divisors (see below), whose sum is σ = 1748160. Its totient is φ = 844712.

The previous prime is 1289083. The next prime is 1289111. The reversal of 1289091 is 1909821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1289091 - 2³ = 1289083 is a prime.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1219091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3465 + ... + 3818.

It is an arithmetic number, because the mean of its divisors is an integer number (218520).

2^1289091 is an apocalyptic number.

1289091 is a deficient number, since it is larger than the sum of its proper divisors (459069).

1289091 is an equidigital number, since it uses as much as digits as its factorization.

1289091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7345.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 1289091 is about 1135.3814337041. The cubic root of 1289091 is about 108.8331481952.

The spelling of 1289091 in words is "one million, two hundred eighty-nine thousand, ninety-one".