1311331212 has 18 divisors (see below), whose sum is σ = 3314753988. Its totient is φ = 437110392.

The previous prime is 1311331211. The next prime is 1311331237. The reversal of 1311331212 is 2121331131.

1311331212 is a `hidden beast` number, since 1 + 311 + 331 + 21 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

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 (1311331211) 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, 18212898 + ... + 18212969.

Almost surely, 2^1311331212 is an apocalyptic number.

1311331212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1311331212 is an abundant number, since it is smaller than the sum of its proper divisors (2003422776).

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

1311331212 is a wasteful number, since it uses less digits than its factorization.

1311331212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36425877 (or 36425872 counting only the distinct ones).

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

The square root of 1311331212 is about 36212.3074658327. The cubic root of 1311331212 is about 1094.5546897601.

Adding to 1311331212 its reverse (2121331131), we get a palindrome (3432662343).

The spelling of 1311331212 in words is "one billion, three hundred eleven million, three hundred thirty-one thousand, two hundred twelve".