1287581516 has 12 divisors (see below), whose sum is σ = 2426596032. Its totient is φ = 594268368.

The previous prime is 1287581509. The next prime is 1287581539. The reversal of 1287581516 is 6151857821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12380540 + ... + 12380643.

It is an arithmetic number, because the mean of its divisors is an integer number (202216336).

Almost surely, 2^1287581516 is an apocalyptic number.

It is an amenable number.

1287581516 is a deficient number, since it is larger than the sum of its proper divisors (1139014516).

1287581516 is a wasteful number, since it uses less digits than its factorization.

1287581516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24761200 (or 24761198 counting only the distinct ones).

The product of its digits is 134400, while the sum is 44.

The square root of 1287581516 is about 35882.8861158074. The cubic root of 1287581516 is about 1087.9065156756.

The spelling of 1287581516 in words is "one billion, two hundred eighty-seven million, five hundred eighty-one thousand, five hundred sixteen".