1281025 has 6 divisors (see below), whose sum is σ = 1588502. Its totient is φ = 1024800.

The previous prime is 1280989. The next prime is 1281029. The reversal of 1281025 is 5201821.

It can be written as a sum of positive squares in 3 ways, for example, as 53361 + 1227664 = 231^2 + 1108^2 .

It is not a de Polignac number, because 1281025 - 2¹³ = 1272833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1280993 and 1281011.

It is not an unprimeable number, because it can be changed into a prime (1281029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25596 + ... + 25645.

2^1281025 is an apocalyptic number.

It is an amenable number.

1281025 is a deficient number, since it is larger than the sum of its proper divisors (307477).

1281025 is an equidigital number, since it uses as much as digits as its factorization.

1281025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51251 (or 51246 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1281025 is about 1131.8237495299. The cubic root of 1281025 is about 108.6056789942.

Adding to 1281025 its reverse (5201821), we get a palindrome (6482846).

The spelling of 1281025 in words is "one million, two hundred eighty-one thousand, twenty-five".