1281503 has 2 divisors, whose sum is σ = 1281504. Its totient is φ = 1281502.

The previous prime is 1281463. The next prime is 1281521. The reversal of 1281503 is 3051821.

It is a strong prime.

It is an emirp because it is prime and its reverse (3051821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1281503 - 2⁶ = 1281439 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (1281523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640751 + 640752.

It is an arithmetic number, because the mean of its divisors is an integer number (640752).

2^1281503 is an apocalyptic number.

1281503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281503 is an equidigital number, since it uses as much as digits as its factorization.

1281503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1281503 is about 1132.0348934551. The cubic root of 1281503 is about 108.6191856416.

The spelling of 1281503 in words is "one million, two hundred eighty-one thousand, five hundred three".