1287651275 has 6 divisors (see below), whose sum is σ = 1596687612. Its totient is φ = 1030121000.

The previous prime is 1287651259. The next prime is 1287651331. The reversal of 1287651275 is 5721567821.

It is not a de Polignac number, because 1287651275 - 2⁴ = 1287651259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25753001 + ... + 25753050.

It is an arithmetic number, because the mean of its divisors is an integer number (266114602).

Almost surely, 2^1287651275 is an apocalyptic number.

1287651275 is a deficient number, since it is larger than the sum of its proper divisors (309036337).

1287651275 is an equidigital number, since it uses as much as digits as its factorization.

1287651275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51506061 (or 51506056 counting only the distinct ones).

The product of its digits is 235200, while the sum is 44.

The square root of 1287651275 is about 35883.8581398378. The cubic root of 1287651275 is about 1087.9261623023.

The spelling of 1287651275 in words is "one billion, two hundred eighty-seven million, six hundred fifty-one thousand, two hundred seventy-five".