1281323003 has 2 divisors, whose sum is σ = 1281323004. Its totient is φ = 1281323002.

The previous prime is 1281322961. The next prime is 1281323023. The reversal of 1281323003 is 3003231821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1281323003 - 2¹⁴ = 1281306619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1281323003.

It is not a weakly prime, because it can be changed into another prime (1281323023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640661501 + 640661502.

It is an arithmetic number, because the mean of its divisors is an integer number (640661502).

Almost surely, 2^1281323003 is an apocalyptic number.

1281323003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281323003 is an equidigital number, since it uses as much as digits as its factorization.

1281323003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1281323003 is about 35795.5723938031. The cubic root of 1281323003 is about 1086.1409993549.

Adding to 1281323003 its reverse (3003231821), we get a palindrome (4284554824).

The spelling of 1281323003 in words is "one billion, two hundred eighty-one million, three hundred twenty-three thousand, three".