1191409 has 2 divisors, whose sum is σ = 1191410. Its totient is φ = 1191408.

The previous prime is 1191373. The next prime is 1191431. The reversal of 1191409 is 9041911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 705600 + 485809 = 840^2 + 697^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191409 - 2⁹ = 1190897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1191439) 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 as a sum of consecutive naturals, namely, 595704 + 595705.

It is an arithmetic number, because the mean of its divisors is an integer number (595705).

2^1191409 is an apocalyptic number.

It is an amenable number.

1191409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191409 is an equidigital number, since it uses as much as digits as its factorization.

1191409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 1191409 is about 1091.5168345014. The cubic root of 1191409 is about 106.0116576712.

It can be divided in two parts, 1191 and 409, that added together give a square (1600 = 40²).

The spelling of 1191409 in words is "one million, one hundred ninety-one thousand, four hundred nine".