1131205 has 4 divisors (see below), whose sum is σ = 1357452. Its totient is φ = 904960.

The previous prime is 1131191. The next prime is 1131217. The reversal of 1131205 is 5021311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5021311 = 41 ⋅122471.

It can be written as a sum of positive squares in 2 ways, for example, as 638401 + 492804 = 799^2 + 702^2 .

It is not a de Polignac number, because 1131205 - 2⁷ = 1131077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113116 + ... + 113125.

It is an arithmetic number, because the mean of its divisors is an integer number (339363).

2^1131205 is an apocalyptic number.

It is an amenable number.

1131205 is a deficient number, since it is larger than the sum of its proper divisors (226247).

1131205 is an equidigital number, since it uses as much as digits as its factorization.

1131205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226246.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 1131205 is about 1063.5812145765. The cubic root of 1131205 is about 104.1950543075.

Adding to 1131205 its reverse (5021311), we get a palindrome (6152516).

The spelling of 1131205 in words is "one million, one hundred thirty-one thousand, two hundred five".