1231205 has 4 divisors (see below), whose sum is σ = 1477452. Its totient is φ = 984960.

The previous prime is 1231201. The next prime is 1231207. The reversal of 1231205 is 5021321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5021321 = 29 ⋅173149.

It can be written as a sum of positive squares in 2 ways, for example, as 954529 + 276676 = 977^2 + 526^2 .

It is not a de Polignac number, because 1231205 - 2² = 1231201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231201) 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, 123116 + ... + 123125.

It is an arithmetic number, because the mean of its divisors is an integer number (369363).

2^1231205 is an apocalyptic number.

It is an amenable number.

1231205 is a deficient number, since it is larger than the sum of its proper divisors (246247).

1231205 is an equidigital number, since it uses as much as digits as its factorization.

1231205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246246.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 1231205 is about 1109.5967736074. The cubic root of 1231205 is about 107.1791043497.

Adding to 1231205 its reverse (5021321), we get a palindrome (6252526).

The spelling of 1231205 in words is "one million, two hundred thirty-one thousand, two hundred five".