1231312 has 20 divisors (see below), whose sum is σ = 2445156. Its totient is φ = 600320.

The previous prime is 1231309. The next prime is 1231313. The reversal of 1231312 is 2131321.

It can be written as a sum of positive squares in 2 ways, for example, as 355216 + 876096 = 596^2 + 936^2 .

It is a super-2 number, since 2×1231312² = 3032258482688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231292 and 1231301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231313) 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, 283 + ... + 1594.

2^1231312 is an apocalyptic number.

It is an amenable number.

1231312 is a deficient number, since it is larger than the sum of its proper divisors (1213844).

1231312 is a wasteful number, since it uses less digits than its factorization.

1231312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1926 (or 1920 counting only the distinct ones).

The product of its digits is 36, while the sum is 13.

The square root of 1231312 is about 1109.6449882733. The cubic root of 1231312 is about 107.1822091216.

Adding to 1231312 its reverse (2131321), we get a palindrome (3362633).

Subtracting 1231312 from its reverse (2131321), we obtain a palindrome (900009).

The spelling of 1231312 in words is "one million, two hundred thirty-one thousand, three hundred twelve".