1281345 has 16 divisors (see below), whose sum is σ = 2208192. Its totient is φ = 630720.

The previous prime is 1281331. The next prime is 1281349. The reversal of 1281345 is 5431821.

It is not a de Polignac number, because 1281345 - 2⁶ = 1281281 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1281349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3091 + ... + 3480.

It is an arithmetic number, because the mean of its divisors is an integer number (138012).

2^1281345 is an apocalyptic number.

1281345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281345 is a deficient number, since it is larger than the sum of its proper divisors (926847).

1281345 is a wasteful number, since it uses less digits than its factorization.

1281345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6592.

The product of its digits is 960, while the sum is 24.

The square root of 1281345 is about 1131.9651054692. The cubic root of 1281345 is about 108.6147214729.

The spelling of 1281345 in words is "one million, two hundred eighty-one thousand, three hundred forty-five".