1288316681 has 4 divisors (see below), whose sum is σ = 1288943232. Its totient is φ = 1287690132.

The previous prime is 1288316611. The next prime is 1288316683. The reversal of 1288316681 is 1866138821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1288316681 is a prime.

It is a super-2 number, since 2×1288316681² = 3319519741085711522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288316683) 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, 310181 + ... + 314306.

It is an arithmetic number, because the mean of its divisors is an integer number (322235808).

Almost surely, 2^1288316681 is an apocalyptic number.

It is an amenable number.

1288316681 is a deficient number, since it is larger than the sum of its proper divisors (626551).

1288316681 is an equidigital number, since it uses as much as digits as its factorization.

1288316681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626550.

The product of its digits is 110592, while the sum is 44.

The square root of 1288316681 is about 35893.1286042329. The cubic root of 1288316681 is about 1088.1135287499.

The spelling of 1288316681 in words is "one billion, two hundred eighty-eight million, three hundred sixteen thousand, six hundred eighty-one".