1287081187 has 12 divisors (see below), whose sum is σ = 1510473096. Its totient is φ = 1093444800.

The previous prime is 1287081121. The next prime is 1287081209. The reversal of 1287081187 is 7811807821.

It is not a de Polignac number, because 1287081187 - 2²³ = 1278692579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287081287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110689 + ... + 121762.

It is an arithmetic number, because the mean of its divisors is an integer number (125872758).

Almost surely, 2^1287081187 is an apocalyptic number.

1287081187 is a deficient number, since it is larger than the sum of its proper divisors (223391909).

1287081187 is a wasteful number, since it uses less digits than its factorization.

1287081187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232578 (or 232571 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 43.

The square root of 1287081187 is about 35875.9137444609. The cubic root of 1287081187 is about 1087.7655843532.

The spelling of 1287081187 in words is "one billion, two hundred eighty-seven million, eighty-one thousand, one hundred eighty-seven".