1213231312 has 20 divisors (see below), whose sum is σ = 2352947616. Its totient is φ = 606019040.

The previous prime is 1213231289. The next prime is 1213231319. The reversal of 1213231312 is 2131323121.

It is a self number, because there is not a number n which added to its sum of digits gives 1213231312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213231319) 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, 20278 + ... + 53269.

Almost surely, 2^1213231312 is an apocalyptic number.

It is an amenable number.

1213231312 is a deficient number, since it is larger than the sum of its proper divisors (1139716304).

1213231312 is a wasteful number, since it uses less digits than its factorization.

1213231312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74586 (or 74580 counting only the distinct ones).

The product of its digits is 216, while the sum is 19.

The square root of 1213231312 is about 34831.4701383677. The cubic root of 1213231312 is about 1066.5499592798.

Adding to 1213231312 its reverse (2131323121), we get a palindrome (3344554433).

The spelling of 1213231312 in words is "one billion, two hundred thirteen million, two hundred thirty-one thousand, three hundred twelve".