1321549 has 2 divisors, whose sum is σ = 1321550. Its totient is φ = 1321548.

The previous prime is 1321517. The next prime is 1321571. The reversal of 1321549 is 9451231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1225449 + 96100 = 1107^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321549 - 2⁵ = 1321517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660774 + 660775.

It is an arithmetic number, because the mean of its divisors is an integer number (660775).

2^1321549 is an apocalyptic number.

It is an amenable number.

1321549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321549 is an equidigital number, since it uses as much as digits as its factorization.

1321549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 1321549 is about 1149.5864473801. The cubic root of 1321549 is about 109.7390231912.

It can be divided in two parts, 132 and 1549, that added together give a square (1681 = 41²).

The spelling of 1321549 in words is "one million, three hundred twenty-one thousand, five hundred forty-nine".