1288191671 has 4 divisors (see below), whose sum is σ = 1387283352. Its totient is φ = 1189099992.

The previous prime is 1288191601. The next prime is 1288191679. The reversal of 1288191671 is 1761918821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1288191671 - 2²² = 1283997367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288191679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49545821 + ... + 49545846.

It is an arithmetic number, because the mean of its divisors is an integer number (346820838).

Almost surely, 2^1288191671 is an apocalyptic number.

1288191671 is a deficient number, since it is larger than the sum of its proper divisors (99091681).

1288191671 is an equidigital number, since it uses as much as digits as its factorization.

1288191671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99091680.

The product of its digits is 48384, while the sum is 44.

The square root of 1288191671 is about 35891.3871423215. The cubic root of 1288191671 is about 1088.0783330887.

The spelling of 1288191671 in words is "one billion, two hundred eighty-eight million, one hundred ninety-one thousand, six hundred seventy-one".