1331211312 has 30 divisors (see below), whose sum is σ = 3725543172. Its totient is φ = 443737056.

The previous prime is 1331211311. The next prime is 1331211313. The reversal of 1331211312 is 2131121331.

1331211312 is a `hidden beast` number, since 1 + 331 + 21 + 1 + 312 = 666.

It is an interprime number because it is at equal distance from previous prime (1331211311) and next prime (1331211313).

It is a super-2 number, since 2×1331211312² = 3544247114393522688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1331211311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4622118 + ... + 4622405.

Almost surely, 2^1331211312 is an apocalyptic number.

1331211312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1331211312 is an abundant number, since it is smaller than the sum of its proper divisors (2394331860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1331211312 is a wasteful number, since it uses less digits than its factorization.

1331211312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9244537 (or 9244528 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1331211312 is about 36485.7686228480. The cubic root of 1331211312 is about 1100.0582095918.

Adding to 1331211312 its reverse (2131121331), we get a palindrome (3462332643).

The spelling of 1331211312 in words is "one billion, three hundred thirty-one million, two hundred eleven thousand, three hundred twelve".