1281344685 has 8 divisors (see below), whose sum is σ = 2050151520. Its totient is φ = 683383824.

The previous prime is 1281344663. The next prime is 1281344693. The reversal of 1281344685 is 5864431821.

It is a happy number.

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

It is not a de Polignac number, because 1281344685 - 2⁷ = 1281344557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42711475 + ... + 42711504.

It is an arithmetic number, because the mean of its divisors is an integer number (256268940).

Almost surely, 2^1281344685 is an apocalyptic number.

1281344685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281344685 is a deficient number, since it is larger than the sum of its proper divisors (768806835).

1281344685 is an equidigital number, since it uses as much as digits as its factorization.

1281344685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85422987.

The product of its digits is 184320, while the sum is 42.

The square root of 1281344685 is about 35795.8752512074. The cubic root of 1281344685 is about 1086.1471257249.

The spelling of 1281344685 in words is "one billion, two hundred eighty-one million, three hundred forty-four thousand, six hundred eighty-five".