1281963115 has 32 divisors (see below), whose sum is σ = 1650767040. Its totient is φ = 952356864.

The previous prime is 1281963077. The next prime is 1281963127. The reversal of 1281963115 is 5113691821.

It is not a de Polignac number, because 1281963115 - 2¹¹ = 1281961067 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3295341 + ... + 3295729.

It is an arithmetic number, because the mean of its divisors is an integer number (51586470).

Almost surely, 2^1281963115 is an apocalyptic number.

1281963115 is a deficient number, since it is larger than the sum of its proper divisors (368803925).

1281963115 is a wasteful number, since it uses less digits than its factorization.

1281963115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831.

The product of its digits is 12960, while the sum is 37.

The square root of 1281963115 is about 35804.5124949356. The cubic root of 1281963115 is about 1086.3218374787.

The spelling of 1281963115 in words is "one billion, two hundred eighty-one million, nine hundred sixty-three thousand, one hundred fifteen".