1287130919 has 4 divisors (see below), whose sum is σ = 1287551496. Its totient is φ = 1286710344.

The previous prime is 1287130913. The next prime is 1287130921. The reversal of 1287130919 is 9190317821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1287130919 - 2¹⁶ = 1287065383 is a prime.

It is a super-2 number, since 2×1287130919² = 3313412005291569122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287130913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205664 + ... + 211829.

It is an arithmetic number, because the mean of its divisors is an integer number (321887874).

Almost surely, 2^1287130919 is an apocalyptic number.

1287130919 is a deficient number, since it is larger than the sum of its proper divisors (420577).

1287130919 is an equidigital number, since it uses as much as digits as its factorization.

1287130919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420576.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 1287130919 is about 35876.6068490319. The cubic root of 1287130919 is about 1087.7795943633.

The spelling of 1287130919 in words is "one billion, two hundred eighty-seven million, one hundred thirty thousand, nine hundred nineteen".