1281277812 has 12 divisors (see below), whose sum is σ = 2989648256. Its totient is φ = 427092600.

The previous prime is 1281277801. The next prime is 1281277817. The reversal of 1281277812 is 2187721821.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281277817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53386564 + ... + 53386587.

Almost surely, 2^1281277812 is an apocalyptic number.

1281277812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1281277812 is an abundant number, since it is smaller than the sum of its proper divisors (1708370444).

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

1281277812 is a wasteful number, since it uses less digits than its factorization.

1281277812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106773158 (or 106773156 counting only the distinct ones).

The product of its digits is 25088, while the sum is 39.

The square root of 1281277812 is about 35794.9411509504. The cubic root of 1281277812 is about 1086.1282301638.

The spelling of 1281277812 in words is "one billion, two hundred eighty-one million, two hundred seventy-seven thousand, eight hundred twelve".