1281497339 has 4 divisors (see below), whose sum is σ = 1281575856. Its totient is φ = 1281418824.

The previous prime is 1281497311. The next prime is 1281497359. The reversal of 1281497339 is 9337941821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9337941821 = 13 ⋅718303217.

It is a cyclic number.

It is not a de Polignac number, because 1281497339 - 2⁸ = 1281497083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1281497293 and 1281497302.

It is not an unprimeable number, because it can be changed into a prime (1281497359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4544 + ... + 50829.

It is an arithmetic number, because the mean of its divisors is an integer number (320393964).

Almost surely, 2^1281497339 is an apocalyptic number.

1281497339 is a deficient number, since it is larger than the sum of its proper divisors (78517).

1281497339 is an equidigital number, since it uses as much as digits as its factorization.

1281497339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78516.

The product of its digits is 326592, while the sum is 47.

The square root of 1281497339 is about 35798.0074724837. The cubic root of 1281497339 is about 1086.1902570075.

The spelling of 1281497339 in words is "one billion, two hundred eighty-one million, four hundred ninety-seven thousand, three hundred thirty-nine".