1287056567 has 4 divisors (see below), whose sum is σ = 1287871200. Its totient is φ = 1286241936.

The previous prime is 1287056557. The next prime is 1287056597. The reversal of 1287056567 is 7656507821.

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 1287056567 - 2⁸ = 1287056311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287056557) by changing a digit.

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, 404942 + ... + 408107.

It is an arithmetic number, because the mean of its divisors is an integer number (321967800).

Almost surely, 2^1287056567 is an apocalyptic number.

1287056567 is a deficient number, since it is larger than the sum of its proper divisors (814633).

1287056567 is an equidigital number, since it uses as much as digits as its factorization.

1287056567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814632.

The product of its (nonzero) digits is 705600, while the sum is 47.

The square root of 1287056567 is about 35875.5706156710. The cubic root of 1287056567 is about 1087.7586485153.

The spelling of 1287056567 in words is "one billion, two hundred eighty-seven million, fifty-six thousand, five hundred sixty-seven".