1281319 has 4 divisors (see below), whose sum is σ = 1379896. Its totient is φ = 1182744.

The previous prime is 1281317. The next prime is 1281331. The reversal of 1281319 is 9131821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1281319 - 2¹ = 1281317 is a prime.

It is a super-2 number, since 2×1281319² = 3283556759522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1281293 and 1281302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49269 + ... + 49294.

It is an arithmetic number, because the mean of its divisors is an integer number (344974).

2^1281319 is an apocalyptic number.

1281319 is a deficient number, since it is larger than the sum of its proper divisors (98577).

1281319 is an equidigital number, since it uses as much as digits as its factorization.

1281319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98576.

The product of its digits is 432, while the sum is 25.

The square root of 1281319 is about 1131.9536209580. The cubic root of 1281319 is about 108.6139868277.

It can be divided in two parts, 1281 and 319, that added together give a square (1600 = 40²).

The spelling of 1281319 in words is "one million, two hundred eighty-one thousand, three hundred nineteen".