1281371712 has 56 divisors (see below), whose sum is σ = 3399434400. Its totient is φ = 425972736.

The previous prime is 1281371687. The next prime is 1281371713. The reversal of 1281371712 is 2171731821.

It is not an unprimeable number, because it can be changed into a prime (1281371713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63964 + ... + 81572.

Almost surely, 2^1281371712 is an apocalyptic number.

1281371712 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 1281371712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1699717200).

1281371712 is an abundant number, since it is smaller than the sum of its proper divisors (2118062688).

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

1281371712 is a wasteful number, since it uses less digits than its factorization.

1281371712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18003 (or 17993 counting only the distinct ones).

The product of its digits is 4704, while the sum is 33.

The square root of 1281371712 is about 35796.2527647797. The cubic root of 1281371712 is about 1086.1547622576.

The spelling of 1281371712 in words is "one billion, two hundred eighty-one million, three hundred seventy-one thousand, seven hundred twelve".