1281739 has 2 divisors, whose sum is σ = 1281740. Its totient is φ = 1281738.

The previous prime is 1281727. The next prime is 1281751. The reversal of 1281739 is 9371821.

It is a balanced prime because it is at equal distance from previous prime (1281727) and next prime (1281751).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281739 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1281739.

It is not a weakly prime, because it can be changed into another prime (1281779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640869 + 640870.

It is an arithmetic number, because the mean of its divisors is an integer number (640870).

2^1281739 is an apocalyptic number.

1281739 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281739 is an equidigital number, since it uses as much as digits as its factorization.

1281739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 1281739 is about 1132.1391257262. The cubic root of 1281739 is about 108.6258529571.

The spelling of 1281739 in words is "one million, two hundred eighty-one thousand, seven hundred thirty-nine".