1311282012 has 72 divisors (see below), whose sum is σ = 3269746480. Its totient is φ = 408913920.

The previous prime is 1311282001. The next prime is 1311282023. The reversal of 1311282012 is 2102821131.

It is an interprime number because it is at equal distance from previous prime (1311282001) and next prime (1311282023).

It is a self number, because there is not a number n which added to its sum of digits gives 1311282012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 626664 + ... + 628752.

Almost surely, 2^1311282012 is an apocalyptic number.

1311282012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311282012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1634873240).

1311282012 is an abundant number, since it is smaller than the sum of its proper divisors (1958464468).

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

1311282012 is a wasteful number, since it uses less digits than its factorization.

1311282012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311 (or 2292 counting only the distinct ones).

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

The square root of 1311282012 is about 36211.6281324107. The cubic root of 1311282012 is about 1094.5410006774.

The spelling of 1311282012 in words is "one billion, three hundred eleven million, two hundred eighty-two thousand, twelve".