1161209 has 4 divisors (see below), whose sum is σ = 1327104. Its totient is φ = 995316.

The previous prime is 1161203. The next prime is 1161217. The reversal of 1161209 is 9021611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1161209 - 2⁸ = 1160953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82937 + ... + 82950.

It is an arithmetic number, because the mean of its divisors is an integer number (331776).

2^1161209 is an apocalyptic number.

It is an amenable number.

1161209 is a deficient number, since it is larger than the sum of its proper divisors (165895).

1161209 is an equidigital number, since it uses as much as digits as its factorization.

1161209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165894.

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

The square root of 1161209 is about 1077.5940794195. The cubic root of 1161209 is about 105.1082481532.

The spelling of 1161209 in words is "one million, one hundred sixty-one thousand, two hundred nine".