1288351139 has 4 divisors (see below), whose sum is σ = 1288749720. Its totient is φ = 1287952560.

The previous prime is 1288351133. The next prime is 1288351153. The reversal of 1288351139 is 9311538821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9311538821 = 13 ⋅716272217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1288351139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1288351096 and 1288351105.

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 in 3 ways as a sum of consecutive naturals, for example, 194402 + ... + 200919.

It is an arithmetic number, because the mean of its divisors is an integer number (322187430).

Almost surely, 2^1288351139 is an apocalyptic number.

1288351139 is a deficient number, since it is larger than the sum of its proper divisors (398581).

1288351139 is an equidigital number, since it uses as much as digits as its factorization.

1288351139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398580.

The product of its digits is 51840, while the sum is 41.

The square root of 1288351139 is about 35893.6086093332. The cubic root of 1288351139 is about 1088.1232297502.

The spelling of 1288351139 in words is "one billion, two hundred eighty-eight million, three hundred fifty-one thousand, one hundred thirty-nine".