1281323039 has 2 divisors, whose sum is σ = 1281323040. Its totient is φ = 1281323038.

The previous prime is 1281323023. The next prime is 1281323047. The reversal of 1281323039 is 9303231821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1281323039 - 2⁴ = 1281323023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1281322996 and 1281323014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1281323059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640661519 + 640661520.

It is an arithmetic number, because the mean of its divisors is an integer number (640661520).

Almost surely, 2^1281323039 is an apocalyptic number.

1281323039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281323039 is an equidigital number, since it uses as much as digits as its factorization.

1281323039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1281323039 is about 35795.5728966586. The cubic root of 1281323039 is about 1086.1410095270.

The spelling of 1281323039 in words is "one billion, two hundred eighty-one million, three hundred twenty-three thousand, thirty-nine".