1281116806 has 8 divisors (see below), whose sum is σ = 1921930920. Its totient is φ = 640473168.

The previous prime is 1281116803. The next prime is 1281116843. The reversal of 1281116806 is 6086111821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281116803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21796 + ... + 55111.

It is an arithmetic number, because the mean of its divisors is an integer number (240241365).

Almost surely, 2^1281116806 is an apocalyptic number.

1281116806 is a deficient number, since it is larger than the sum of its proper divisors (640814114).

1281116806 is an equidigital number, since it uses as much as digits as its factorization.

1281116806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85238.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 1281116806 is about 35792.6920753385. The cubic root of 1281116806 is about 1086.0827337888.

The spelling of 1281116806 in words is "one billion, two hundred eighty-one million, one hundred sixteen thousand, eight hundred six".