1287928171 has 8 divisors (see below), whose sum is σ = 1356975360. Its totient is φ = 1219968552.

The previous prime is 1287928157. The next prime is 1287928183. The reversal of 1287928171 is 1718297821.

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

It is a cyclic number.

It is not a de Polignac number, because 1287928171 - 2¹⁹ = 1287403883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287928111) 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, 269461 + ... + 274198.

It is an arithmetic number, because the mean of its divisors is an integer number (169621920).

Almost surely, 2^1287928171 is an apocalyptic number.

1287928171 is a deficient number, since it is larger than the sum of its proper divisors (69047189).

1287928171 is a wasteful number, since it uses less digits than its factorization.

1287928171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543785.

The product of its digits is 112896, while the sum is 46.

The square root of 1287928171 is about 35887.7161574821. The cubic root of 1287928171 is about 1088.0041391112.

The spelling of 1287928171 in words is "one billion, two hundred eighty-seven million, nine hundred twenty-eight thousand, one hundred seventy-one".