1211205 has 8 divisors (see below), whose sum is σ = 1937952. Its totient is φ = 645968.

The previous prime is 1211191. The next prime is 1211207. The reversal of 1211205 is 5021121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211205 - 2⁶ = 1211141 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211207) 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 7 ways as a sum of consecutive naturals, for example, 40359 + ... + 40388.

It is an arithmetic number, because the mean of its divisors is an integer number (242244).

2^1211205 is an apocalyptic number.

1211205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211205 is a deficient number, since it is larger than the sum of its proper divisors (726747).

1211205 is an equidigital number, since it uses as much as digits as its factorization.

1211205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80755.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 1211205 is about 1100.5475909746. The cubic root of 1211205 is about 106.5955852382.

Adding to 1211205 its reverse (5021121), we get a palindrome (6232326).

It can be divided in two parts, 121 and 1205, that added together give a triangular number (1326 = T₅₁).

The spelling of 1211205 in words is "one million, two hundred eleven thousand, two hundred five".