1287966617 has 12 divisors (see below), whose sum is σ = 1503144720. Its totient is φ = 1100362536.

The previous prime is 1287966611. The next prime is 1287966619. The reversal of 1287966617 is 7166697821.

It is not a de Polignac number, because 1287966617 - 2¹⁰ = 1287965593 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1287966611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27767 + ... + 57852.

It is an arithmetic number, because the mean of its divisors is an integer number (125262060).

Almost surely, 2^1287966617 is an apocalyptic number.

It is an amenable number.

1287966617 is a deficient number, since it is larger than the sum of its proper divisors (215178103).

1287966617 is an equidigital number, since it uses as much as digits as its factorization.

1287966617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85940 (or 85933 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 53.

The square root of 1287966617 is about 35888.2517963748. The cubic root of 1287966617 is about 1088.0149650231.

The spelling of 1287966617 in words is "one billion, two hundred eighty-seven million, nine hundred sixty-six thousand, six hundred seventeen".