1491009 has 8 divisors (see below), whose sum is σ = 2140992. Its totient is φ = 917520.

The previous prime is 1491001. The next prime is 1491013. The reversal of 1491009 is 9001941.

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

It is not a de Polignac number, because 1491009 - 2³ = 1491001 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1491009.

It is not an unprimeable number, because it can be changed into a prime (1491001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19077 + ... + 19154.

It is an arithmetic number, because the mean of its divisors is an integer number (267624).

2^1491009 is an apocalyptic number.

It is an amenable number.

1491009 is a deficient number, since it is larger than the sum of its proper divisors (649983).

1491009 is a wasteful number, since it uses less digits than its factorization.

1491009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38247.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1491009 is about 1221.0687941308. The cubic root of 1491009 is about 114.2422518515.

The spelling of 1491009 in words is "one million, four hundred ninety-one thousand, nine".