1282656385 has 4 divisors (see below), whose sum is σ = 1539187668. Its totient is φ = 1026125104.

The previous prime is 1282656343. The next prime is 1282656391. The reversal of 1282656385 is 5836562821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5836562821 = 47221 ⋅123601.

It can be written as a sum of positive squares in 2 ways, for example, as 428614209 + 854042176 = 20703^2 + 29224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1282656385 - 2⁹ = 1282655873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 128265634 + ... + 128265643.

It is an arithmetic number, because the mean of its divisors is an integer number (384796917).

Almost surely, 2^1282656385 is an apocalyptic number.

It is an amenable number.

1282656385 is a deficient number, since it is larger than the sum of its proper divisors (256531283).

1282656385 is an equidigital number, since it uses as much as digits as its factorization.

1282656385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256531282.

The product of its digits is 691200, while the sum is 46.

The square root of 1282656385 is about 35814.1925079988. The cubic root of 1282656385 is about 1086.5176253850.

The spelling of 1282656385 in words is "one billion, two hundred eighty-two million, six hundred fifty-six thousand, three hundred eighty-five".