1491321 has 8 divisors (see below), whose sum is σ = 2141440. Its totient is φ = 917712.

The previous prime is 1491299. The next prime is 1491377. The reversal of 1491321 is 1231941.

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

It is not a de Polignac number, because 1491321 - 2¹⁰ = 1490297 is a prime.

It is a Duffinian number.

It is a Curzon number.

1491321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1491421) 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, 19081 + ... + 19158.

It is an arithmetic number, because the mean of its divisors is an integer number (267680).

2^1491321 is an apocalyptic number.

It is an amenable number.

1491321 is a deficient number, since it is larger than the sum of its proper divisors (650119).

1491321 is a wasteful number, since it uses less digits than its factorization.

1491321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38255.

The product of its digits is 216, while the sum is 21.

The square root of 1491321 is about 1221.1965443777. The cubic root of 1491321 is about 114.2502198554.

The spelling of 1491321 in words is "one million, four hundred ninety-one thousand, three hundred twenty-one".