1287061 has 2 divisors, whose sum is σ = 1287062. Its totient is φ = 1287060.

The previous prime is 1287059. The next prime is 1287067. The reversal of 1287061 is 1607821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 938961 + 348100 = 969^2 + 590^2 .

It is an emirp because it is prime and its reverse (1607821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287061 - 2¹ = 1287059 is a prime.

Together with 1287059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287067) 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 as a sum of consecutive naturals, namely, 643530 + 643531.

It is an arithmetic number, because the mean of its divisors is an integer number (643531).

2^1287061 is an apocalyptic number.

It is an amenable number.

1287061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287061 is an equidigital number, since it uses as much as digits as its factorization.

1287061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1287061 is about 1134.4871087853. The cubic root of 1287061 is about 108.7759897367.

The spelling of 1287061 in words is "one million, two hundred eighty-seven thousand, sixty-one".