1311228012 has 48 divisors (see below), whose sum is σ = 3088512000. Its totient is φ = 432953280.

The previous prime is 1311227947. The next prime is 1311228013. The reversal of 1311228012 is 2108221131.

It is a self number, because there is not a number n which added to its sum of digits gives 1311228012.

It is not an unprimeable number, because it can be changed into a prime (1311228013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 855687 + ... + 857217.

It is an arithmetic number, because the mean of its divisors is an integer number (64344000).

Almost surely, 2^1311228012 is an apocalyptic number.

1311228012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1311228012 is an abundant number, since it is smaller than the sum of its proper divisors (1777283988).

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

1311228012 is a wasteful number, since it uses less digits than its factorization.

1311228012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2166 (or 2164 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 1311228012 is about 36210.8825078870. The cubic root of 1311228012 is about 1094.5259756803.

Adding to 1311228012 its reverse (2108221131), we get a palindrome (3419449143).

The spelling of 1311228012 in words is "one billion, three hundred eleven million, two hundred twenty-eight thousand, twelve".