1287051 has 4 divisors (see below), whose sum is σ = 1716072. Its totient is φ = 858032.

The previous prime is 1287047. The next prime is 1287059. The reversal of 1287051 is 1507821.

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 1287051 - 2² = 1287047 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1287059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214506 + ... + 214511.

It is an arithmetic number, because the mean of its divisors is an integer number (429018).

2^1287051 is an apocalyptic number.

1287051 is a deficient number, since it is larger than the sum of its proper divisors (429021).

1287051 is an equidigital number, since it uses as much as digits as its factorization.

1287051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429020.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 1287051 is about 1134.4827014988. The cubic root of 1287051 is about 108.7757080192.

It can be divided in two parts, 12870 and 51, that added together give a palindrome (12921).

The spelling of 1287051 in words is "one million, two hundred eighty-seven thousand, fifty-one".