1281425 has 6 divisors (see below), whose sum is σ = 1588998. Its totient is φ = 1025120.

The previous prime is 1281407. The next prime is 1281431. The reversal of 1281425 is 5241821.

It is a Cunningham number, because it is equal to 1132²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 1 + 1281424 = 1^2 + 1132^2 .

It is not a de Polignac number, because 1281425 - 2¹⁰ = 1280401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1281425.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25604 + ... + 25653.

It is an arithmetic number, because the mean of its divisors is an integer number (264833).

2^1281425 is an apocalyptic number.

It is an amenable number.

1281425 is a deficient number, since it is larger than the sum of its proper divisors (307573).

1281425 is an equidigital number, since it uses as much as digits as its factorization.

1281425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51267 (or 51262 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 1281425 is about 1132.0004416960. Note that the first 3 decimals coincide. The cubic root of 1281425 is about 108.6169818574.

The spelling of 1281425 in words is "one million, two hundred eighty-one thousand, four hundred twenty-five".