1212311312 has 10 divisors (see below), whose sum is σ = 2348853198. Its totient is φ = 606155648.

The previous prime is 1212311311. The next prime is 1212311417. The reversal of 1212311312 is 2131132121.

It can be written as a sum of positive squares in only one way, i.e., 955799056 + 256512256 = 30916^2 + 16016^2 .

It is a super-2 number, since 2×1212311312² = 2939397434406322688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212311311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37884713 + ... + 37884744.

Almost surely, 2^1212311312 is an apocalyptic number.

It is an amenable number.

1212311312 is a deficient number, since it is larger than the sum of its proper divisors (1136541886).

1212311312 is an equidigital number, since it uses as much as digits as its factorization.

1212311312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75769465 (or 75769459 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 1212311312 is about 34818.2611857629. The cubic root of 1212311312 is about 1066.2803008669.

Adding to 1212311312 its reverse (2131132121), we get a palindrome (3343443433).

The spelling of 1212311312 in words is "one billion, two hundred twelve million, three hundred eleven thousand, three hundred twelve".