1287101 has 2 divisors, whose sum is σ = 1287102. Its totient is φ = 1287100.

The previous prime is 1287071. The next prime is 1287109. The reversal of 1287101 is 1017821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276900 + 10201 = 1130^2 + 101^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287101 - 2¹⁸ = 1024957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643550 + 643551.

It is an arithmetic number, because the mean of its divisors is an integer number (643551).

2^1287101 is an apocalyptic number.

It is an amenable number.

1287101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287101 is an equidigital number, since it uses as much as digits as its factorization.

1287101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1287101 is about 1134.5047377601. The cubic root of 1287101 is about 108.7771165920. Note that the first 3 decimals are identical.

The spelling of 1287101 in words is "one million, two hundred eighty-seven thousand, one hundred one".