1287168909 has 16 divisors (see below), whose sum is σ = 1848904512. Its totient is φ = 791820288.

The previous prime is 1287168907. The next prime is 1287168919. The reversal of 1287168909 is 9098617821.

It is not a de Polignac number, because 1287168909 - 2¹ = 1287168907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287168907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172749 + ... + 180045.

It is an arithmetic number, because the mean of its divisors is an integer number (115556532).

Almost surely, 2^1287168909 is an apocalyptic number.

It is an amenable number.

1287168909 is a deficient number, since it is larger than the sum of its proper divisors (561735603).

1287168909 is a wasteful number, since it uses less digits than its factorization.

1287168909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11836.

The product of its (nonzero) digits is 435456, while the sum is 51.

The square root of 1287168909 is about 35877.1362987628. The cubic root of 1287168909 is about 1087.7902962895.

The spelling of 1287168909 in words is "one billion, two hundred eighty-seven million, one hundred sixty-eight thousand, nine hundred nine".