1191609 has 12 divisors (see below), whose sum is σ = 1777152. Its totient is φ = 768600.

The previous prime is 1191601. The next prime is 1191611. The reversal of 1191609 is 9061911.

It is not a de Polignac number, because 1191609 - 2³ = 1191601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1191601) 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 11 ways as a sum of consecutive naturals, for example, 1857 + ... + 2414.

It is an arithmetic number, because the mean of its divisors is an integer number (148096).

2^1191609 is an apocalyptic number.

It is an amenable number.

1191609 is a deficient number, since it is larger than the sum of its proper divisors (585543).

1191609 is a wasteful number, since it uses less digits than its factorization.

1191609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4308 (or 4305 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 1191609 is about 1091.6084462847. The cubic root of 1191609 is about 106.0175893441.

It can be divided in two parts, 119 and 1609, that added together give a cube (1728 = 12³).

The spelling of 1191609 in words is "one million, one hundred ninety-one thousand, six hundred nine".