1288638311 has 8 divisors (see below), whose sum is σ = 1358570880. Its totient is φ = 1218916728.

The previous prime is 1288638289. The next prime is 1288638317. The reversal of 1288638311 is 1138368821.

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

It is a de Polignac number, because none of the positive numbers 2^k-1288638311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288638317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40121 + ... + 64706.

It is an arithmetic number, because the mean of its divisors is an integer number (169821360).

Almost surely, 2^1288638311 is an apocalyptic number.

1288638311 is a deficient number, since it is larger than the sum of its proper divisors (69932569).

1288638311 is a wasteful number, since it uses less digits than its factorization.

1288638311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105493.

The product of its digits is 55296, while the sum is 41.

The square root of 1288638311 is about 35897.6087086591. The cubic root of 1288638311 is about 1088.2040708865.

The spelling of 1288638311 in words is "one billion, two hundred eighty-eight million, six hundred thirty-eight thousand, three hundred eleven".