1287861119 has 8 divisors (see below), whose sum is σ = 1311769728. Its totient is φ = 1264112920.

The previous prime is 1287861079. The next prime is 1287861139. The reversal of 1287861119 is 9111687821.

It is a happy number.

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 1287861119 - 2²⁰ = 1286812543 is a prime.

It is a super-2 number, since 2×1287861119² = 3317172523663864322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287861119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287861139) 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, 23837 + ... + 56070.

It is an arithmetic number, because the mean of its divisors is an integer number (163971216).

Almost surely, 2^1287861119 is an apocalyptic number.

1287861119 is a deficient number, since it is larger than the sum of its proper divisors (23908609).

1287861119 is an equidigital number, since it uses as much as digits as its factorization.

1287861119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80205.

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

The square root of 1287861119 is about 35886.7819538058. The cubic root of 1287861119 is about 1087.9852575925.

The spelling of 1287861119 in words is "one billion, two hundred eighty-seven million, eight hundred sixty-one thousand, one hundred nineteen".