1281263 has 2 divisors, whose sum is σ = 1281264. Its totient is φ = 1281262.

The previous prime is 1281257. The next prime is 1281281. The reversal of 1281263 is 3621821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1281263 - 2¹⁸ = 1019119 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1281253) 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, 640631 + 640632.

It is an arithmetic number, because the mean of its divisors is an integer number (640632).

2^1281263 is an apocalyptic number.

1281263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281263 is an equidigital number, since it uses as much as digits as its factorization.

1281263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 1281263 is about 1131.9288846920. The cubic root of 1281263 is about 108.6124044812.

The spelling of 1281263 in words is "one million, two hundred eighty-one thousand, two hundred sixty-three".