1281225 has 24 divisors (see below), whose sum is σ = 2312352. Its totient is φ = 620800.

The previous prime is 1281221. The next prime is 1281229. The reversal of 1281225 is 5221821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1281221) and next prime (1281229).

It is not a de Polignac number, because 1281225 - 2² = 1281221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49 + ... + 1601.

It is an arithmetic number, because the mean of its divisors is an integer number (96348).

2^1281225 is an apocalyptic number.

1281225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281225 is a deficient number, since it is larger than the sum of its proper divisors (1031127).

1281225 is a wasteful number, since it uses less digits than its factorization.

1281225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577 (or 1572 counting only the distinct ones).

The product of its digits is 320, while the sum is 21.

The square root of 1281225 is about 1131.9120990607. The cubic root of 1281225 is about 108.6113307199.

The spelling of 1281225 in words is "one million, two hundred eighty-one thousand, two hundred twenty-five".