1121609 has 6 divisors (see below), whose sum is σ = 1191774. Its totient is φ = 1055360.

The previous prime is 1121599. The next prime is 1121621. The reversal of 1121609 is 9061211.

It can be written as a sum of positive squares in 3 ways, for example, as 525625 + 595984 = 725^2 + 772^2 .

It is not a de Polignac number, because 1121609 - 2¹² = 1117513 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1652 + ... + 2229.

It is an arithmetic number, because the mean of its divisors is an integer number (198629).

2^1121609 is an apocalyptic number.

It is an amenable number.

1121609 is a deficient number, since it is larger than the sum of its proper divisors (70165).

1121609 is an equidigital number, since it uses as much as digits as its factorization.

1121609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3915 (or 3898 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1121609 is about 1059.0604326477. The cubic root of 1121609 is about 103.8995887357.

The spelling of 1121609 in words is "one million, one hundred twenty-one thousand, six hundred nine".