1281665012 has 6 divisors (see below), whose sum is σ = 2242913778. Its totient is φ = 640832504.

The previous prime is 1281664999. The next prime is 1281665029. The reversal of 1281665012 is 2105661821.

It can be written as a sum of positive squares in only one way, i.e., 1222621156 + 59043856 = 34966^2 + 7684^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1281665012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160208123 + ... + 160208130.

It is an arithmetic number, because the mean of its divisors is an integer number (373818963).

Almost surely, 2^1281665012 is an apocalyptic number.

It is an amenable number.

1281665012 is a deficient number, since it is larger than the sum of its proper divisors (961248766).

1281665012 is a wasteful number, since it uses less digits than its factorization.

1281665012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320416257 (or 320416255 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 1281665012 is about 35800.3493279046. The cubic root of 1281665012 is about 1086.2376278528.

The spelling of 1281665012 in words is "one billion, two hundred eighty-one million, six hundred sixty-five thousand, twelve".