1321249 has 2 divisors, whose sum is σ = 1321250. Its totient is φ = 1321248.

The previous prime is 1321247. The next prime is 1321259. The reversal of 1321249 is 9421231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1140624 + 180625 = 1068^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321249 - 2¹ = 1321247 is a prime.

Together with 1321247, it forms a pair of twin primes.

1321249 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1321247) 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 as a sum of consecutive naturals, namely, 660624 + 660625.

It is an arithmetic number, because the mean of its divisors is an integer number (660625).

2^1321249 is an apocalyptic number.

It is an amenable number.

1321249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321249 is an equidigital number, since it uses as much as digits as its factorization.

1321249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 1321249 is about 1149.4559582690. The cubic root of 1321249 is about 109.7307187448.

The spelling of 1321249 in words is "one million, three hundred twenty-one thousand, two hundred forty-nine".