1321109 has 2 divisors, whose sum is σ = 1321110. Its totient is φ = 1321108.

The previous prime is 1321093. The next prime is 1321139. The reversal of 1321109 is 9011231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 902500 + 418609 = 950^2 + 647^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321109 - 2⁴ = 1321093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660554 + 660555.

It is an arithmetic number, because the mean of its divisors is an integer number (660555).

2^1321109 is an apocalyptic number.

It is an amenable number.

1321109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321109 is an equidigital number, since it uses as much as digits as its factorization.

1321109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1321109 is about 1149.3950582807. The cubic root of 1321109 is about 109.7268429063.

The spelling of 1321109 in words is "one million, three hundred twenty-one thousand, one hundred nine".