1288121371 has 4 divisors (see below), whose sum is σ = 1344126672. Its totient is φ = 1232116072.

The previous prime is 1288121363. The next prime is 1288121407. The reversal of 1288121371 is 1731218821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1731218821 = 47 ⋅36834443.

It is not a de Polignac number, because 1288121371 - 2³ = 1288121363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288121171) 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, 28002616 + ... + 28002661.

It is an arithmetic number, because the mean of its divisors is an integer number (336031668).

Almost surely, 2^1288121371 is an apocalyptic number.

1288121371 is a deficient number, since it is larger than the sum of its proper divisors (56005301).

1288121371 is an equidigital number, since it uses as much as digits as its factorization.

1288121371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56005300.

The product of its digits is 5376, while the sum is 34.

The square root of 1288121371 is about 35890.4077853679. The cubic root of 1288121371 is about 1088.0585396320.

The spelling of 1288121371 in words is "one billion, two hundred eighty-eight million, one hundred twenty-one thousand, three hundred seventy-one".