1281023 has 4 divisors (see below), whose sum is σ = 1283400. Its totient is φ = 1278648.

The previous prime is 1280989. The next prime is 1281029. The reversal of 1281023 is 3201821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3201821 = 7 ⋅457403.

It is a cyclic number.

It is not a de Polignac number, because 1281023 - 2⁸ = 1280767 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1280992 and 1281010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281029) 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, 53 + ... + 1601.

It is an arithmetic number, because the mean of its divisors is an integer number (320850).

2^1281023 is an apocalyptic number.

1281023 is a deficient number, since it is larger than the sum of its proper divisors (2377).

1281023 is an equidigital number, since it uses as much as digits as its factorization.

1281023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1281023 is about 1131.8228659998. The cubic root of 1281023 is about 108.6056224740.

Adding to 1281023 its reverse (3201821), we get a palindrome (4482844).

The spelling of 1281023 in words is "one million, two hundred eighty-one thousand, twenty-three".