1288351138 has 4 divisors (see below), whose sum is σ = 1932526710. Its totient is φ = 644175568.

The previous prime is 1288351133. The next prime is 1288351153. The reversal of 1288351138 is 8311538821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8311538821 = 173 ⋅48043577.

It can be written as a sum of positive squares in only one way, i.e., 738589329 + 549761809 = 27177^2 + 23447^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1288351138.

It is not an unprimeable number, because it can be changed into a prime (1288351133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322087783 + ... + 322087786.

Almost surely, 2^1288351138 is an apocalyptic number.

1288351138 is a deficient number, since it is larger than the sum of its proper divisors (644175572).

1288351138 is an equidigital number, since it uses as much as digits as its factorization.

1288351138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644175571.

The product of its digits is 46080, while the sum is 40.

The square root of 1288351138 is about 35893.6085954032. The cubic root of 1288351138 is about 1088.1232294687.

Adding to 1288351138 its reverse (8311538821), we get a palindrome (9599889959).

The spelling of 1288351138 in words is "one billion, two hundred eighty-eight million, three hundred fifty-one thousand, one hundred thirty-eight".